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Archive for the ‘Population Health Management, Genetics & Pharmaceutical’ Category

Reporters: Aviva Lev-Ari, PhD, RN and Pnina Abir-Am, PhD
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Word Cloud By Danielle Smolyar
Jeffrey L. Sturchio

Senior Partner, Rabin Martin

Jeffrey L. Sturchio is senior partner at Rabin Martin, a global health strategy firm in New York. Prior to joining the firm, he served as president and CEO of the Global Health Council. Before joining the Council, Dr. Sturchio was vice president of Corporate Responsibility at Merck & Co. Inc., president of the Merck Company Foundation and chairman of the U. S. Corporate Council on Africa, whose 150 member companies represent some 85 percent of total US private sector investment in Africa. He is a visiting scholar at the Institute for Applied Economics and the Study of Business Enterprise at Johns Hopkins University, a Fellow of the American Association for the Advancement of Science and a member of the Council on Foreign Relations. He received an AB in history from Princeton University and a PhD in the history and sociology of science from the University of Pennsylvania.

World Cancer Day: Treatment Should Not Be a Luxury
Posted: 02/04/2013 10:20 am
Huffington Post IMPACT
Author: Jeffrey L. Sturchio, Senior Partner, Rabin Martin

co-authored by Cary Adams.

All of us have been touched by cancer, whether personally or through the experience of our families and friends. For those of us living in the developed world, many types of cancer have ceased to be the “dread disease” they once were: Given the remarkable advances in basic science and oncology, it’s more a question of what the best course of treatment is, rather than one of availability or affordability. But for most of the world, access to cancer screening, detection, diagnosis and oncology care is still an unattainable luxury. Considering that nearly half of cancer cases — and 55 percent of the deaths — occur in less developed countries, we need to make progress now.

If left unchecked, the annual economic burden of cancer will be an estimated $458 billion by 2030, according to a study by the World Economic Forum and Harvard School of Public Health. But the human cost of 21.4 million new cases per year by 2030 is, quite simply, unacceptable. In commemoration of World Cancer Day (Today, February 4), we call for the global community to step-up its efforts to address cancer and other NCDs.

Cancers, along with other non-communicable diseases (NCDs) such as diabetes, upper respiratory infections and cardiovascular disease, are the leading causes of mortality around the world. Indeed, the number of cancer deaths alone surpasses those attributed to AIDS, tuberculosis and malaria combined. Once considered illnesses of the wealthy, 80 percent of the estimated 36 million NCD-related deaths actually occur in low- to middle- income countries, according to the World Health Organization. And while a global movement for action on NCDs has been gathering momentum in recent years, much remains to be done.

The Institute for Applied Economics, Global Health and the Study of Business Enterprise at Johns Hopkins University recently released a set of policy briefs that present recommendations for Addressing the Gaps in Global Policy and Research for Non-Communicable Disease. The publication compiles the findings of a Working Group of leading experts in the field and offers a road map of actionable recommendations for reducing the global burden of these diseases.

The report echoes many of the themes put forth by the global cancer community for achieving the goals articulated in the World Cancer Declaration. For starters, there needs to be a multi-sectoral approach to cancer. Governments, civil society, academe and the private sector must work together to leverage strengths and efficiencies to advance efforts to reduce the burden of cancer.

Greater participation by the private sector in a transparent and open way will improve efforts against the disease in coming years. Certainly, private-public partnerships to tackle cancer exist, but greater collaboration among stakeholders is needed. One suggestion may be to develop a knowledge exchange network for oncology researchers in industry and academe to accelerate the rate of progress in discovering and developing new vaccines, personalized medicines, pharmaceuticals and other essential medical technologies. While their most significant role is — and will continue to be — in R&D, the private sector can also lend considerable expertise in systems efficiencies, human resource development and supply chain management, to name just a few areas in which their capabilities can improve the global response to cancer.

Governments need to play a more active role in actively reducing and raising awareness about risk factors for cancer and other NCDs. They need to work with civil society and industry to reduce tobacco and excessive alcohol use, while promoting healthier diets and physical activity at the national and community levels. Again the private sector can play a lead role in improving the health impacts of their products to reduce the global growth in NCDs.

Countries need to make greater investments in building the capacity of local health workers so they are more capable of educating patients about reducing their cancer risk through behavior modification as well as immunization against human papilloma virus (HPV) and hepatitis B (HBV) infections (which can lead to cervical cancer and primary liver cancer, respectively). Health workers are the first line of defense, detecting hallmarks of disease and providing cancer screening, treatment and, when necessary, long-term care. Moreover, countries need to re-evaluate how they can retain health workers who are trained in cancer care. Without them, all interventions become impossible.

Finally, there needs to be greater focus on providing equitable access to screening, early diagnosis and treatment. Self-exams and visual inspection with acetic acid for breast cancer and cervical cancer screening respectively, are two excellent examples of effective, inexpensive, life-saving innovations that can be implemented even in low-resource settings. Integrating these methods into existing primary, reproductive and maternal health service models would help reduce the 750,000 deaths from cervical and breast cancer each year.

It’s a lot of work, but for many of us, cancer hits very close to home. By working together to combat cancer, each doing our part, we can begin to make a difference in the lives of millions — making cancer care and treatment not a luxury, but a reality.

Cary Adams is CEO of the Union for International Cancer Control (UICC), which helps the global health community accelerate the fight against cancer. Its growing membership of over 700 organisations in 155 countries features the world’s major cancer societies, ministries of health and patient groups and includes influential policy makers, researchers and experts in cancer prevention and control. Adams and his team focus on global advocacy to deliver the World Cancer Declaration targets by 2020, running global programs that address key cancer issues and use their membership reach to bring about the exchange of best practice globally. He recently became Chair of the NCD Alliance, a coalition of around 2,000 NGOs working on non-communicable diseases.

 SOURCE:
Jeffrey L. Sturchio
Doug Ulman

The Global Burden of Cancer

Posted: 02/04/2011 11:44 am
Most of us in developed countries have dwelled in the shadow of cancer. We’ve anxiously awaited a test result, become intimate with chemotherapy for ourselves or a loved one or held vigil at a bedside.

During those intense and often tragic periods, we usually have options — education, treatment, pain relief and sometimes, blessedly, remission and recovery — that is, if we happen to reside in a wealthy country. Not so for millions of others, adults and children alike, in poorer countries where more than 70 percent of all cancer deaths occur yet five percent or less of cancer resources are allocated to the people living there, despite the growing cancer burden.

Cancer is a growing cause of death worldwide. The cancer burden in low- and middle-income countries is increasingly disproportionate. Globally in 2009, there were an estimated 12.9 million cases of cancer, a number expected to double by 2020, with 60 percent of new cases occurring in low- and middle-income countries.

Not only do these countries carry more than half the disease burden, they lack the resources for cancer awareness and prevention, early detection, treatment or palliative options to relieve the staggering pain and human suffering if the disease is untreated — an unthinkable outcome for people who have cancer in rich nations.

Cancer also has the most devastating economic impact of any cause of death in the world, according to the recent landmark report, “The Global Economic Cost of Cancer,” released by the American Cancer Society and Livestrong. Premature deaths and disability from cancer cost the global economy nearly 1 trillion dollars a year. The data from this study provides compelling evidence that balancing the world’s global health agenda to address cancer more effectively will save not only millions of lives, but also billions of dollars.

By making cancer a global priority, as with many other non-communicable diseases, cancer deaths can be prevented an estimated 40 percent or more. This goal is a particular focus of this year’s World Cancer Day(today, February 4). But prevention can only be achieved through investments in awareness and education. Neglect of prevention leads to unaffordable treatment.

Even though tobacco use is the most preventable cause of cancer, lung cancer still kills more people worldwide than any other — a trend likely to surge unless efforts for global tobacco control are greatly accelerated. Tobacco use is responsible for 1.8 million cancer deaths per year, 60 percent in low- and middle-income nations, thanks to the tobacco industry’s unrelenting country-by-country approach to marketing their addictive product, including to youth. Last year, the Australian Broadcasting Corporation won a Global Health Council Excellence in Media Award for its hard-hitting and poignant exposé of tobacco marketing in Indonesia, “80 Million a Day: Big Tobacco’s New Frontier.” We need to cast more light on this invisible killer.

Other preventable risk factors for all cancers are unhealthy lifestyles (including alcohol abuse, inadequate diet and physical inactivity), exposure to occupational (e.g., asbestos) or environmental carcinogens (e.g., indoor air pollution), radiation (e.g., ultraviolet and ionizing radiation) and infections.

Cancers due to infectious diseases account for 8-10 percent of cases in high income countries, but 20-26 percent in developing countries. The human-to-human spread of viruses and bacteria can lead to liver and stomach cancers, lymphomas and leukemia. In addition to infections, many reproductive health diseases are linked to cancer. Strengthening the health systems of developing countries will pave the way for improved vaccine delivery and wider coverage of immunizations that will save lives and protect people’s health.

The Global Health Council and Livestrong call on global partners, allies, donors, policymakers, communities and individuals to work collaboratively to address the treatment expenditure gap and change the trajectory of this tidal wave of cancer. We have a choice – invest now or pay later with significant government spending and the loss of millions of lives and lessened productivity.

Capacity building is essential. Ministries of health, education and finance need to be engaged in developing and supporting plans that include both training of personnel to diagnose and treat cancer patients and strategies to reduce costs and strengthen health systems.

We need to focus on cancer surveillance to set standards to understand better the burden of cancer and the impacts of interventions. We need to implement relevant interventions at scale, including those that draw on successful models that address other diseases. We must rapidly expand information and awareness campaigns on a global scale to reach deeply into affected communities of developing countries. And we need continued investments in research and development for improved knowledge of the science of cancer and better drugs, vaccines and new tools for cancer prevention and control.

Starting today, advocates, governments, non-profits and the private sector must drive new and effective policies, programs and investments. Patients and survivors around the world cannot wait a moment longer for us to advance the global fight against cancer. Failing to act is indefensible — the human and economic costs are too high.

See more information at “Cancer in Developing Countries,” Global Health Council.

 SOURCE:

Around the globe, from Cape Town to Kathmandu, from Manila to Mexico City, millions will be celebrating the 100th anniversary of International Women’s Day on March 8 — a day to honor the achievements made by and for women. Looking at this milestone through a global health lens, we see an increasingly positive picture, but the view is far from perfect. In fact, we stand at a crossroads.

Globally, we’ve seen a notable decline in maternal deaths from half a million women to 342,000 annually. This is still far too many, but it is an important step in the right direction. Yet this progress is at risk, with mounting efforts underway to deny access to one of the best investments in women’s health: family planning.

In Bangladesh, just last month, a national survey showed a 40 percent drop in maternal deaths during the last decade. One of the contributing factors? Family planning. That is an unprecedented step forward.

Tanzania achieved a 21.5 percent drop in maternal deaths during the last five years, precipitated in part by increased access to and enthusiastic use of modern contraception. Another step forward.

In places like Ghana and Ethiopia, women every day have access to more contraceptive options — another step forward — as they endeavor to plan their families and define their futures. Women like Ayera Kabele, an ambitious 30-year old in Addis Ababa. She married in her early 20s and had a child soon thereafter. But she was also a student who wanted to finish college — a dream achieved because she was able to delay having another child by using an IUD. Four years later, degree in hand, Ayera and her husband were ready for their second child — another dream achieved. Yet another step forward.

This scenario between couples plays out every day around the world — including here in the United States. These are universal conversations about when to start a family and how many children to have. Anyone who has been a party to one can appreciate how vital they are to the health and well-being not only of women, but also of their families as well.

Why is that? In addition to saving women from death and injury during pregnancy or childbirth, saving mothers’ lives saves babies’ lives. Family planning also boosts women’s economic empowerment and creates an environment where children have a better chance not only to survive, but also to thrive. Strong and healthy families lead to stronger and more stable communities, in a virtuous cycle toward prosperity for nations.

We know that up to one-third of maternal deaths could be prevented if every woman who wanted to use contraception to limit or space her births was able to do so. In part, this is due to fewer unwanted pregnancies — especially when women have no other options — and thus to fewer women seeking abortion to end them. Mostly, though, it’s because every pregnancy and childbirth poses risks, especially where medical care is inadequate, if it exists at all. This is how family planning saves lives — and more.

Yet flying in the face of mounting evidence, there is a real risk that the United States foreign assistance budget will include drastic cuts to international family planning — the catalyst to so much good in countless communities worldwide. Indeed, at a moment when every budget dollar must be used as efficiently and effectively as possible, few investments pay better long-term dividends than family planning.

Just four years remain until the deadline for achieving the Millennium Development Goals (MDGs) set by the United Nations. A report released last year rated access to reproductive health care as low or moderate in 70 percent of the regions surveyed. This is not acceptable.

There have been strong policy and funding commitments made in the United States’ Global Health Initiative as well as at the United Nations (U.N.) to bolster access to and support for family planning as vital investments to improve the lives of women and families worldwide. The year 2010 also saw the launch of the first-ever U.N.’s Global Strategy for Women’s and Children’s Health and ongoing efforts by the State Department’s Office on Global Women’s Issues to link foreign policy with women’s rights. There is much reason for optimism.

As we mark the centennial of International Women’s Day, supporters of women’s health worldwide must continue to advocate for family planning and reproductive health services, which have done so much for women and girls in the U.S. and in so many countries around the world.

See the Global Health Council position paper on Maternal, Newborn, Child and Reproductive Health.

 Follow Jeffrey L. Sturchio on Twitter: www.twitter.com/globalhealthorg
SOURCE:

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Reporter: Aviva Lev-Ari PhD, RN

 

CDPH Issues 10 Penalties to Hospitals

Date: 2/6/2013

Number: 13-005

Contact: Anita Gore (916) 440-7259

SACRAMENTO

 

The California Department of Public Health (CDPH) issued 10 penalties today to seven California hospitals and fines totaling $775,000 after investigations found the facilities’ noncompliance with licensing requirements caused, or was likely to cause, serious injury or death to patients.

The following hospitals received penalties:

1. Adventist Medical Center, Hanford, Kings County: The hospital failed to ensure the health and safety of a patient when it did not follow established policies and procedures for safe distribution and administration of medication. The penalty is $50,000. This is the hospital’s third administrative penalty.

2. Fresno Surgical Hospital, Fresno, Fresno County: The hospital failed to ensure the health and safety of a patient when it did not follow established surgical policies and procedures. The penalty is $75,000. This is the hospital’s second administrative penalty.

3. Memorial Medical Center, Modesto, Stanislaus County: The hospital failed to ensure the health and safety of a patient when it did not follow established surgical policies and procedures related to patient care. The penalty is $50,000. This is the hospital’s first administrative penalty.

4. Memorial Medical Center, Modesto, Stanislaus County: The hospital failed to ensure the health and safety of a patient when it did not follow established policies and procedures related to patient care. The penalty is $75,000. This is the hospital’s second administrative penalty.

5. Placentia Linda Hospital, Placentia, Orange County: The hospital failed to ensure the health and safety of a patient when it did not follow established policies and procedures relating to patient protection. The penalty is $50,000. This is the hospital’s first administrative penalty.

6. Santa Clara Valley Medical Center, San Jose, Santa Clara County: The hospital failed to ensure the health and safety of a patient when it did not follow established policies and procedures related to care in emergency situations. The penalty is $100,000. This is the hospital’s third administrative penalty.

7. St. Mary’s Medical Center, San Francisco, San Francisco County: The hospital failed to ensure the health and safety of a patient when it did not follow surgical policies and procedures. This resulted in a patient having to undergo a second surgery to remove a retained foreign object. The penalty is $75,000. This is the hospital’s second administrative penalty.

8. St. Mary’s Medical Center, San Francisco, San Francisco County: The hospital failed to ensure the health and safety of a patient when it did not follow established policies and procedures for safe distribution and administration of medication. The penalty is $100,000. This is the hospital’s third administrative penalty.

9. UCSF Medical Center, San Francisco, San Francisco County: The hospital failed to ensure the health and safety of a patient when it did not follow surgical policies and procedures. This resulted in a patient having to undergo a second surgery to remove a retained foreign object. The penalty is $100,000. This is the hospital’s seventh administrative penalty.

10. UCSF Medical Center, San Francisco, San Francisco County: The hospital failed to ensure the health and safety of a patient when it did not follow surgical policies and procedures. This resulted in a patient having to undergo a second surgery to remove a retained foreign object. The penalty is $100,000. This is the hospital’s eighth administrative penalty.

Administrative penalties are issued under authority granted by Health and Safety Code section 1280.1. Incidents that occurred prior to 2009 carry a fine of $25,000. New legislation took effect January 1, 2009, that increased fines for incidents that occurred in 2009 or later. Under the new provisions, an administrative penalty carries a fine of $50,000 for the first violation, $75,000 for the second, and $100,000 for the third or subsequent violation by the licensee. Incidents that occurred prior to 2009 are not counted when determining the fine amounts. When hospitals receive their survey findings, they are required to provide CDPH with a plan of correction to

prevent future incidents. Hospitals can appeal an administrative penalty by requesting a hearing within ten calendar days of notification. If a hearing is requested and the penalty upheld following an appeal, the penalties must be paid.

All hospitals in California are required to be in compliance with applicable state and federal laws and regulations governing general acute care hospitals, acute psychiatric hospitals, and special hospitals. The hospitals are required to comply with these standards to ensure quality of care.

SOURCE:

http://www.cdph.ca.gov/Pages/NR13-005.aspx

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Reporter and Curator: Dr. Sudipta Saha, Ph.D.

Meiosis plays a crucial role in generating haploid gametes for sexual reproduction. In most organisms, the presence of crossovers between homologous chromosomes, in combination with connections between sister chromatids, creates a physical connection that ensures regular segregation of homologs at the first of the two meiotic divisions.

Abnormality in generating crossovers is the leading cause of miscarriage and birth defects. Crossovers also create new combinations of alleles, thus contributing to genetic diversity and evolution. Recent linkage disequilibrium and pedigree studies have shown that the distribution of recombination is highly uneven across the human genome, as in all studied organisms. Substantial recombination active regions are not conserved between humans and chimpanzees or among different human populations, suggesting that these regions are quickly evolving and might even be individual-specific. However, such variation in the human population would be masked by the population average, and resolution of this variation would require comparison of recombination genome-wide among many single genomes.

Whole-genome amplification (WGA) of single sperm cells was proposed decades ago to facilitate mapping recombination at the individual level. With the development of highthroughput genotyping technologies, wholegenome mapping of recombination events in single gametes of an individual is achievable and was recently demonstrated by performing WGA by multiple displacement amplification (MDA) on single sperm cells, followed by genotyping with DNA microarrays recently demonstrated by Wang et al.. However, due to the amplification bias and, consequently, insufficient marker density, the resolution of crossover locations has been limited to ~150 kb thus far. In addition, in their recent work, Wang et al. relied on prior knowledge of the chromosome-level haplotype information of the analyzed individual, which is experimentally inconvenient to obtain and is currently available for only a few individuals.

Meiotic recombination creates genetic diversity and ensures segregation of homologous chromosomes. Previous population analyses yielded results averaged among individuals and affected by evolutionary pressures. In this study 99 sperm from an Asian male was sequenced by using the newly developed amplification method—multiple annealing and looping-based amplification cycles—to phase the personal genome and map recombination events at high resolution, which are non-uniformly distributed across the genome in the absence of selection pressure. The paucity of recombination near transcription start sites observed in individual sperm indicates that such a phenomenon is intrinsic to the molecular mechanism of meiosis. Interestingly, a decreased crossover frequency combined with an increase of autosomal aneuploidy is observable on a global per-sperm basis.

Source References:

http://www.ncbi.nlm.nih.gov/pubmed/23258895

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Curator: Aviva Lev-Ari, PhD, RN

Chaperon Protein Mechanism inspired MIT Team to Model the Role of Genetic Mutations on Cancer Progression, proposing the next generation of Oncology drugs to aim at Suppression of Passenger Mutations. Current drug, in clinical trials, use the Chaperon Protein Mechanism to suppress Driver Mutations.

Deleterious Mutations in Cancer Progression

Kirill S. Korolev1, Christopher McFarland2, and Leonid A. Mirny3

1Department of Physics, MIT, Cambridge, MA.

E-mail: papers.korolev@gmail.com

2Graduate Program in Biophysics, Harvard University, Cambridge, MA.

3Health Sciences and Technology, MIT, Cambridge, MA

The research was funded by the National Institutes of Health/National Cancer Institute Physical Sciences Oncology Center at MIT.

SOURCE:

http://cnls.lanl.gov/q-bio/wiki/images/4/40/Abstract.pdf

Deleterious passenger mutations significantly affect evolutionary dynamics of cancer. Including passenger mutations in evolutionary models is necessary to understand the role of genetic diversity in cancer progression and to create new treatments based on the accumulation of deleterious passenger mutations.

Evolutionary models of cancer almost exclusively focus on the acquisition of driver mutations, which are beneficial to cancer cells. The driver mutations, however, are only a small fraction of the mutations found in tumors. The other mutations, called passenger mutations, are typically neglected because their effect on fitness is assumed to be very small. Recently, it has been suggested that some passenger mutations are slightly deleterious. We find that deleterious passengers significantly affect cancer progression. In particular, they lead to a critical tumor size, below which tumors shrink on average, and to an optimal mutation rate for cancer evolution.

ANCER is an outcome of somatic evolution [1-3]. To outcompete their benign sisters, cancer cells need to acquire many heritable changes (driver mutations) that enable proliferation. In addition to the rare beneficial drivers, cancer cells must also acquire neutral or slightly deleterious passenger mutations [4]. Indeed, the number of possible passengers exceeds the number of possible drivers by orders of magnitude. Surprisingly, the effect of passenger mutations on cancer progression has not been explored. To address this problem, we developed an evolutionary model of cancer progression, which includes both drivers and passengers. This model was analyzed both numerically and analytically to understand how mutation rate, population size, and fitness effects of mutations affect cancer progression.

RESULTS

Upon including passengers in our model, we found that cancer is no longer a straightforward progression to malignancy. In particular, there is a critical population size such that smaller populations accumulate passengers and decline, while larger populations accumulate drivers and grow. The transition to cancer for small initial populations is, therefore, stochastic in nature and is similar to diffusion over an energy barrier in chemical kinetics. We also found that there is an optimal mutation rate for cancer development, and passengers with intermediate fitness costs are most detrimental to cancer. The existence of an optimal mutation rate could explain recent clinical data [5] and is in stark contrast to the predictions of the models neglecting passengers. We also show that our theory is consistent with recent sequencing data.

SOURCE:

http://cnls.lanl.gov/q-bio/wiki/images/4/40/Abstract.pdf

Just as some mutations in the genome of cancer cells actively spur tumor growth, it would appear there are also some that do the reverse, and act to slow it down or even stop it, according to a new US study led by MIT.

Senior author, Leonid Mirny, an associate professor of physics and health sciences and technology at MIT, and colleagues, write about this surprise finding in a paper to be published online this week in the Proceedings of the National Academy of Sciences.

In a statement released on Monday, Mirny tells the press:

“Cancer may not be a sequence of inevitable accumulation of driver events, but may be actually a delicate balance between drivers and passengers.”

“Spontaneous remissions or remissions triggered by drugs may actually be mediated by the load of deleterious passenger mutations,” he suggests.

Cancer Cell‘s Genome Has “Drivers” and “Passengers”

Your average cancer cell has a genome littered with thousands of mutations and hundreds of mutated genes. But only a handful of these mutated genes are drivers that are responsible for the uncontrolled growth that leads to tumors.

Up until this study, cancer researchers have mostly not paid much attention to the “passenger” mutations, believing that because they were not “drivers”, they had little effect on cancer progression. 

Now Mirny and colleagues have discovered, to their surprise, that the “passengers” aren’t there just for the ride. In sufficient numbers, they can slow down, and even stop, the cancer cells from growing and replicating as tumors. 

New Drugs Could Target the Passenger Mutations in Protein Chaperoning

Although there are already several drugs in development that target the effect of chaperone proteins in cancer, they are aiming to suppress driver mutations.

Recently, biochemists at the University of Massachusetts Amherst“trapped” a chaperone in action, providing a dynamic snapshot of its mechanism as a way to help development of new drugs that target drivers.

But Mirny and colleagues say there is now another option: developing drugs that target the same chaperoning process, but their aim would be to encourage the suppressive effect of the passenger mutations.

They are now comparing cells with identical driver mutations but different passenger mutations, to see which have the strongest effect on growth.

They are also inserting the cells into mice to see which are the most likely to lead to secondary tumors (metastasize).

Written by Catharine Paddock PhD
Copyright: Medical News Today

SOURCE:

http://www.medicalnewstoday.com/articles/255920.php

After proteins are synthesized, they need to be folded into the correct shape, and chaperones help with that process. In cancerous cells, chaperones help proteins fold into the correct shape even when they are mutated, helping to suppress the effects of deleterious mutations.
Several potential drugs that inhibit chaperone proteins are now in clinical trials to treat cancer, although researchers had believed that they acted by suppressing the effects of driver mutations, not by enhancing the effects of passengers.

In current studies, the researchers are comparing cancer cell lines that have identical driver mutations but a different load of passenger mutations, to see which grow faster. They are also injecting the cancer cell lines into mice to see which are likeliest to metastasize.

Drugs that tip the balance in favor of the passenger mutations could offer a new way to treat cancer, the researchers say, beating it with its own weapon — mutations. Although the influence of a single passenger mutation is minuscule, “collectively they can have a profound effect,” Mirny says. “If a drug can make them a little bit more deleterious, it’s still a tiny effect for each passenger, but collectively this can build up.”

In natural populations, selection weeds out deleterious mutations. However, Mirny and his colleagues suspected that the evolutionary process in cancer can proceed differently, allowing mutations with only a slightly harmful effect to accumulate.

If enough deleterious passengers are present, their cumulative effects can slow tumor growth, the simulations found. Tumors may become dormant, or even regress, but growth can start up again if new driver mutations are acquired. This matches the cancer growth patterns often seen in human patients.

“Spontaneous remissions or remissions triggered by drugs may actually be mediated by the load of deleterious passenger mutations.”

When they analyzed passenger mutations found in genomic data taken from cancer patients, the researchers found the same pattern predicted by their model — accumulation of large quantities of slightly deleterious mutations.

REFERENCE

Massachusetts Institute of Technology (2013, February 4). Some cancer mutations slow tumor growth. ScienceDaily. Retrieved February 4, 2013, from http://www.sciencedaily.com­/releases/2013/02/130204154011.htm

Biochemists Trap A Chaperone Machine In Action

Main Category: Biology / Biochemistry
Article Date: 11 Dec 2012 – 0:00 PST

Molecular chaperones have emerged as exciting new potential drug targets, because scientists want to learn how to stop cancer cells, for example, from using chaperones to enable their uncontrolled growth. Now a team of biochemists at the University of Massachusetts Amherst led by Lila Gierasch have deciphered key steps in the mechanism of the Hsp70 molecular machine by “trapping” this chaperone in action, providing a dynamic snapshot of its mechanism.

She and colleagues describe this work in the current issue of Cell. Gierasch’s research on Hsp70 chaperones is supported by a long-running grant to her lab from NIH’s National Institute for General Medical Sciences.

Molecular chaperones like the Hsp70s facilitate the origami-like folding of proteins, made in the cell’s nanofactories or ribosomes, from where they emerge unstructured like noodles. Proteins only function when folded into their proper structures, but the process is so difficult under cellular conditions that molecular chaperone helpers are needed. 

The newly discovered information about chaperone action is important because all rapidly dividing cells use a lot of Hsp70, Gierasch points out. “The saying is that cancer cells are addicted to Hsp70 because they rely on this chaperone for explosive new cell growth. Cancer shifts our body’s production of Hsp70 into high gear. If we can figure out a way to take that away from cancer cells, maybe we can stop the out-of-control tumor growth. To find a molecular way to inhibit Hsp70, you’ve got to know how it works and what it needs to function, so you can identify its vulnerabilities.”

Chaperone proteins in cells, from bacteria to humans, act like midwives or bodyguards, protecting newborn proteins from misfolding and existing proteins against loss of structure caused by stress such as heat or a fever. In fact, the heat shock protein (Hsp) group includes a variety of chaperones active in both these situations.

As Gierasch explains, “New proteins emerge into a challenging environment. It’s very crowded in the cell and it would be easy for them to get their sticky amino acid chains tangled and clumped together. Chaperones bind to them and help to avoid this aggregation, which is implicated in many pathologies such as neurodegenerative diseases. This role of chaperones has also heightened interest in using them therapeutically.”

However, chaperones must not bind too tightly or a protein can’t move on to do its job. To avoid this, chaperones rapidly cycle between tight and loose binding states, determined by whether ATP or ADP is bound. In the loose state, a protein client is free to fold or to be picked up by another chaperone that will help it fold to do its cellular work. In effect, Gierasch says, Hsp70s create a “holding pattern” to keep the protein substrate viable and ready for use, but also protected.

She and colleagues knew the Hsp70’s structure in both tight and loose binding affinity states, but not what happened between, which is essential to understanding the mechanism of chaperone action. Using the analogy of a high jump, they had a snapshot of the takeoff and landing, but not the top of the jump. “Knowing the end points doesn’t tell us how it works. There is a shape change in there that we wanted to see,” Gierasch says.

To address this, she and her colleagues postdoctoral fellows Anastasia Zhuravleva and Eugenia Clerico obtained “fingerprints” of the structure of Hsp70 in different states by using state-of-the-art nuclear magnetic resonance (NMR) methods that allowed them to map how chemical environments of individual amino acids of the protein change in different sample conditions. Working with an Hsp70 known as DnaK from E. coli bacteria, Zhuravleva and Clerico assigned its NMR spectra. In other words, they determined which peaks came from which amino acids in this large molecule.

The UMass Amherst team then mutated the Hsp70 so that cycling between tight and loose binding states stopped. As Gierasch explains, “Anastasia and Eugenia were able to stop the cycle part-way through the high jump, so to speak, and obtain the molecular fingerprint of a transient intermediate.” She calls this accomplishment “brilliant.”

Now that the researchers have a picture of this critical allosteric state, that is, one in which events at one site control events in another, Gierasch says many insights emerge. For example, it appears nature uses this energetically tense state to “tune” alternate versions of Hsp70 to perform different cellular functions. “Tuning means there may be evolutionary changes that let the chaperone work with its partners optimally,” she notes.

“And if you want to make a drug that controls the amount of Hsp70 available to a cell, our work points the way toward figuring out how to tickle the molecule so you can control its shape and its ability to bind to its client. We’re not done, but we made a big leap,” Gierasch adds. “We now have a idea of what the Hsp70 structure is when it is doing its job, which is extraordinarily important.” 

Article adapted by Medical News Today from original press release. Click ‘references’ tab above for source.
Visit our biology / biochemistry section for the latest news on this subject.
SOURCE:

REFERENCES

[1] Michor F, Iwasa Y, and Nowak MA (2004) Dynamics of cancer

progression. Nature Reviews Cancer 4, 197-205.

[2] Crespi B and Summers K (2005) Evolutionary biology of cancer.

Trends in Ecology and Evolution 20, 545-552.

[3] Merlo LMF, et al. (2006) Cancer as an evolutionary and ecological

process. Nature Reviews Cancer 6, 924-935.

[4] McFarland C, et al. “Accumulation of deleterious passenger mutations

in cancer,” in preparation.

[5] Birkbak NJ, et al. (2011) Paradoxical relationship between

chromosomal instability and survival outcome in cancer. Cancer

Research 71,3447-3452.

Other related articles on this Open Access Online Scientific Journal include the following:

Hold on. Mutations in Cancer do good.

http://pharmaceuticalintelligence.com/2013/02/04/hold-on-mutations-in-cancer-do-good/

Rational Design of Allosteric Inhibitors and Activators Using the Population-Shift Model: In Vitro Validation and Application to an Artificial Biosensor

http://pharmaceuticalintelligence.com/2012/10/26/rational-design-of-allosteric-inhibitors-and-activators-using-the-population-shift-model-in-vitro-validation-and-application-to-an-artificial-biosensor/

LEADERS in Genome Sequencing of Genetic Mutations for Therapeutic Drug Selection in Cancer Personalized Treatment: Part 2

http://pharmaceuticalintelligence.com/2013/01/13/leaders-in-genome-sequencing-of-genetic-mutations-for-therapeutic-drug-selection-in-cancer-personalized-treatment-part-2/

Exome sequencing of serous endometrial tumors shows recurrent somatic mutations in chromatin-remodeling and ubiquitin ligase complex genes

http://pharmaceuticalintelligence.com/2012/12/18/exome-sequencing-of-serous-endometrial-tumors-shows-recurrent-somatic-mutations-in-chromatin-remodeling-and-ubiquitin-ligase-complex-genes/

Genome-Wide Detection of Single-Nucleotide and Copy-Number Variation of a Single Human Cell(1)

http://pharmaceuticalintelligence.com/2013/02/03/genome-wide-detection-of-single-nucleotide-and-copy-number-variation-of-a-single-human-cell/

Gastric Cancer: Whole-genome reconstruction and mutational signatures

http://pharmaceuticalintelligence.com/2012/12/24/gastric-cancer-whole-genome-reconstruction-and-mutational-signatures-2/

Pregnancy with a Leptin-Receptor Mutation

http://pharmaceuticalintelligence.com/2012/10/31/pregnancy-with-a-leptin-receptor-mutation/

Mitochondrial mutation analysis might be “1-step” away

http://pharmaceuticalintelligence.com/2012/08/14/mitochondrial-mutation-analysis-might-be-1-step-away/

Genome-wide Single-Cell Analysis of Recombination Activity and De Novo Mutation Rates in Human Sperm

http://pharmaceuticalintelligence.com/2012/08/07/genome-wide-single-cell-analysis-of-recombination-activity-and-de-novo-mutation-rates-in-human-sperm/

A Prion Like-Protein, Protein Kinase Mzeta and Memory Maintenance

http://pharmaceuticalintelligence.com/2012/10/19/a-prion-like-protein-protein-kinase-mzeta-and-memory-maintenance/

Hope for Male Contraception: A small molecule that inhibits a protein important for chromatin organization can cause reversible sterility in male mice

http://pharmaceuticalintelligence.com/2012/09/03/hope-for-male-contraception-a-small-molecule-that-inhibits-a-protein-important-for-chromatin-organization-can-cause-reversible-sterility-in-male-mice/

Protein Folding may lead to better FLU Vaccine

http://pharmaceuticalintelligence.com/2012/07/25/protein-folding-may-lead-to-better-flu-vaccine/

SNAP: Predict Effect of Non-synonymous Polymorphisms: How well Genome Interpretation Tools could Translate to the Clinic

http://pharmaceuticalintelligence.com/2013/02/03/snap-predict-effect-of-non-synonymous-polymorphisms-how-well-genome-interpretation-tools-could-translate-to-the-clinic/

Drugging the Epigenome

http://pharmaceuticalintelligence.com/2013/02/01/drugging-the-epigenome/

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Genome-Wide Detection of Single-Nucleotide and Copy-Number Variation of a Single Human Cell(1)

Reporter, Writer: Stephen J. Williams, Ph.D.

 

Most tumors exhibit a level of diversity, at the cellular, histologic, and even genetic level (2).  This genetic heterogeneity within a tumor has been a focus of recent research efforts to analyze the characteristics, expression patterns, and genetic differences between individual tumor cells.  This genetic diversity is usually manifested as single nucleotide variations (SNV) and copy number variations (CNV), both of which provide selection pressures in both cancer and evolution.

As cancer research and personalized medicine is focused on analyzing this tumor heterogeneity it has become pertinent view the tumor as a heterogeneous population of cells instead of as a homogenous mass.  In, fact, studies have suggested that cancer cell lines growing on plastic in culture, even though thought of as clonogenic, can actually display a varied degree of expression differences between neighboring cells growing on the same dish.  Indeed, cancer stem cells show an asynchronous cell division, for example a parent CD133-positive cell will divide into a CD133-positive and a CD133-negative cell(3). In addition, the discovery that circulating tumor cells (a rare population of circulating cells in the blood) can be prognostic of outcome in cancer such as inflammatory breast cancer(4), it is ever more important to develop methods to analyze single cell populations.

Harvard University researchers, Dr. Chenghang Zong, Sijia Lu, Alec Chapman and Sunney Xie developed a new amplification method utilizing multiple annealing and looping-based amplification cycles (MALBAC)(1).   A quasilinear preamplification process is used on pictograms of DNA genomic fragments (form 10 to 100 kb) isolated from a single cell.   This is performed to reduce the bias associated with nonlinear DNA amplification.  A series of random primers (which the authors termed MALBAC primers, constructed with a common sequence tags) are annealed at low temperature (0 °C). PCR rounds produce semiamplicons.  Further rounds of amplification, after a step of looping the amplicons, result in full amplicons with complementary ends.  When the two ends hybridize to form the looped DNA, this prevents use of this loop structure as a template, therefore leading to a close-to–linear amplification.    The process allows for a higher fidelity of DNA replication and the ability to amplify a whole genome.  The amplicons are then sequenced either by whole-genome sequencing methods using Sanger-sequencing to verify any single nucleotide polymorphisms.  This procedure of MALBAC-amplification resulted in coverage of 85-93% of the genome of a single cell.

As proof of principle, the authors used MALBAC to amplify the DNA of single SW480 cancer cells (picked from a clonally expanded population of a heterogeneous population (the bulk DNA).  Comparison of the MALBAC method versus the MDA method revealed copy number variations (CNV) between three individual cells, which had been picked from the clonally expanded pool. Their results were in agreement with karyotyping studies on the SW480 cell line.  Meticulous quality controls were performed to limit contamination, high false positive rates of SNV detection due to amplification bias, and false positives due to amplification or sequencing errors.

Interestingly, the authors found 35 unique single nucleotide variations which h had occurred from 20 cell divisions from a single SW480 cancer cell.  This resulted in an estimated 49 mutations which occurred in 20 generations, yielding a mutation rate of 2.5 nucleotides per generation.  In addition, the authors were able to map some of these mutations on various chromosomes and perform next-gen sequencing (deep sequencing) to verify the nucleotide mutations and found an unusually high purine-pyrimidine exchange rate.

In a subsequent paper, investigators from the same group at Harvard used this technology to sequence 99 sperm cells from a single individual to study genetic diversity created during meiotic recombination, a mechanism involved in evolution and development(5).

Reference:

1.            Zong, C., Lu, S., Chapman, A. R., and Xie, X. S. (2012) Science 338, 1622-1626

2.            Cooke, S. L., Temple, J., Macarthur, S., Zahra, M. A., Tan, L. T., Crawford, R. A., Ng, C. K., Jimenez-Linan, M., Sala, E., and Brenton, J. D. (2011) British journal of cancer 104, 361-368

3.            Guo, R., Wu, Q., Liu, F., and Wang, Y. (2011) Oncology reports 25, 141-146

4.            Giuliano, M., Giordano, A., Jackson, S., Hess, K. R., De Giorgi, U., Mego, M., Handy, B. C., Ueno, N. T., Alvarez, R. H., De Laurentiis, M., De Placido, S., Valero, V., Hortobagyi, G. N., Reuben, J. M., and Cristofanilli, M. (2011) Breast cancer research : BCR 13, R67

5.            Lu, S., Zong, C., Fan, W., Yang, M., Li, J., Chapman, A. R., Zhu, P., Hu, X., Xu, L., Yan, L., Bai, F., Qiao, J., Tang, F., Li, R., and Xie, X. S. (2012) Science 338, 1627-1630

Other related posts on this website regarding Cancer and Genomics include:

 

Cancer Genomics – Leading the Way by Cancer Genomics Program at UC Santa Cruz

 

Identifying Aggressive Breast Cancers by Interpreting the Mathematical Patterns in the Cancer Genome

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Reporter: Aviva Lev-Ari, PhD, RN

With IBM Help, Coriell Spins off For-Profit Entity to Store Whole-Genome Sequencing Data

Review of Coriell Institute Profile

Personalized Medicine: An Institute Profile – Coriell Institute for Medical Research: Part 3

http://pharmaceuticalintelligence.com/2013/01/13/personalized-medicine-an-institute-profile-coriell-institute-for-medical-research-part-3/

UPDATED on 5/16/2013

The Bank Where Doctors Can Stash Your Genome

A new company offers a “gene vault” for doctors who want to add genomics to patient care.

Genomic sequencing might be more common in medicine if doctors had a simple way to send for the test and keep track of the data.That’s the hope of Coriell Life Sciences in Camden, New Jersey, a startup that grew out of a partnership between the Coriell Institute for Medical Research and IBM. The company wants to facilitate the process of ordering, storing, and interpreting whole-genome-sequence data for doctors. The company launched in January and is now working with different health-care providers to set up its service. “The intent is that the doctor would order a test like any other diagnostic test they order today,” says Scott Megill, president of Coriell Life Sciences. The company would facilitate sequencing the patient’s DNA (through existing sequencing companies such as Illumina or Ion Torrent), store it in its so-called gene vault, and act as the middleman between doctors and companies that offer interpretation services. Finally, “we will return the genetic result in the human readable form back to the electronic medical record so the doctor can read it and interpret it for the patient,” says Megill.

“You need a robust software infrastructure for storing, analyzing, and presenting information,” says Jon Hirsch, who founded Syapse, a California-based company developing software to analyze biological data sets for diagnosing patients. “Until that gets built, you can generate all the data you want, but it’s not going to have any impact outside the few major centers of genomics medicine,” he says.

The company will use a board of scientific advisors to guide them to the best interpretation programs available. “No one company is in position to interpret the entire genome for its meaning,” says Michael Christman, CEO of the Coriell Institute for Medical Research. “But by having one’s sequence in the gene vault, then the physician will be able to order interpretative engines, analogous to apps for the iPhone,” he says. Doctors could order an app to analyze a patient’s genome for DNA variants linked to poor drug response at one point, and later on, order another for variants linked to heart disease.

The cloud-based workflow could help doctors in different locations take advantage of expert interpretations anywhere, says Christman. “This would allow a doctor who’s at a community clinic in Tulsa, Oklahoma, order an interpretation of breast cancer sequences derived at Sloan Kettering,” he says.

But while the cloud offers many conveniences, it carries some potential risks. “I am a bit concerned if we really start to outsource data to the cloud without any regulation,” says Emiliano De Cristofaro, a cryptography scientist with Xerox’s PARC who is developing a genomic data storage and sharing platform. “We must not forget that the sensitivity of genomic information is quite unprecedented,” he says. “The human genome is not only a unique identifier but also contains things about ethnic heritage, predisposition to certain diseases including mental disorders, and many other traits.” Data leaks happen all the time, says Cristofaro, and while you can change your password after a security break, “there’s no way to revoke your genome.”

Keeping the genomic data secure is a key component and is the reason the group began a relationship with IBM, says Megill. The data would be stored at the company’s headquarters and would be available only to limited users—doctors and companies that offer diagnostic or other medical interpretation of the genome, he says.

If a patient changes her health-care provider, the data will remain available for her next physician. Storing the data will be free, says Christman.

http://www.technologyreview.com/news/510901/the-bank-where-doctors-can-stash-your-genome/

January 30, 2013

Originally published Jan. 29.

MOUNTAIN VIEW, Calif. – The Coriell Institute for Medical Research in partnership with IBM has launched a for-profit company that will store consumers’ whole-genome sequencing data.

The goal of the spinoff company, called Coriell Life Sciences, “is to address how will a doctor actually use whole-genome sequences in a clinical setting,” CIMR CEO Michael Christman said at a personalized medicine meeting here this week. After doctors order a whole-genome sequence, which would be provided by a sequencing service provider, Coriell Life Sciences will harmonize and store that data in a gene vault for the patient. Physicians then will be able to order certain interpretive analyses from third parties on the sequence based on the patient’s medical needs.

After planning for 18 months, Coriell and IBM launched Coriell Life Sciences a few weeks ago. Describing the company as the “expert custodians” of whole-genome data, Christman explained that patients’ information may remain in the gene vault, regardless of whether they change jobs or healthcare providers. The patient will own their data stored in the vault and will have the ability to consent to which third parties gain access to the information and for what purpose.

Coriell Life Sciences will not charge patients for storing their data. Patients can consent to allow their de-identified data to be used for research, at which point Coriell will add their information to an aggregate research database that will be used for discovery work. Alternatively, patients can remove their sequence from the vault if they choose.

Physicians that have ordered certain interpretive analysis on patients’ genome sequences will receive the results through electronic medical records. If the healthcare provider doesn’t have an EMR in place, then they can use a web portal interface through Coriell Life Sciences.

If a physician orders genomic interpretation of a patients’ data related to episodic care, however, the third-party interpretation company will have the right to the genome sequence information for performing that specific analysis. “For most collaborators, their access to patient data will be limited to only the subset of the total sequence required by their specific interpretation,” Scott Megill, CEO of the new firm, told PGx Reporter via email. “If an interpretation company has a legitimate, non-commercial research aim that could benefit from the use of large anonymized data sets, they will have an opportunity to utilize aggregate, well-consented data like any other research organization.”

Likening Coriell Life Sciences to Apple’s App Store, Megill noted that the company’s core GeneExchange product will offer a marketplace in which genome interpretation companies can charge “fair market rates” for their services. In turn for providing the sales channel, marketing, storage, data harmonization, and electronic medical records integration, Coriell Life Sciences will charge a brokerage fee for each transaction, he explained. A spokesperson for the company said that these transaction fees will be “baked into the overall cost to the payor” for each individual test.

“The data is harmonized and brokered such that it can be interpreted by a variety of clinical applications,” Christman said.

“No one company is well positioned to interpret the entire genome,” he added. “In principle what this would do is allow a doctor in Tulsa, Oklahoma, to order the cancer analysis application … that was developed at MD Anderson or Sloan Kettering.”

Coriell Life Sciences is also developing an application that will allow doctors to gauge pharmacogenomic associations in a patient’s sequence. The PGx app will be developed based on data collected by Coriell over the last five years through its Personalized Medicine Collaborative research project.

Launched in December 2007 for the lay public, the Personalized Medicine Collaborative aims to study the impact of genome-informed treatment on medical care by genotyping patients and reporting only clinically actionable genomic information. The study has so far enrolled thousands of participants and has research partnerships with Cooper University Hospital, Virtua Health, Fox Chase Cancer Center, and Helix Health (PGx Reporter 6/17/2009).

Similar to the Personalized Medicine Collaborative, the PGx app will initially enable doctors to gauge whether their patients are at risk for dozens of complex conditions and learn how they metabolize commonly prescribed drugs. “We will be expanding this offering to ultimately include several dozen drug efficacy and dosage recommendations,” Megill said.

The need for securing people’s genome data will become more acute as advanced sequencing technologies become part of mainstream medical care. Coriell Life Sciences was conceived “from a clear market need, identified in our work in the Coriell Personalized Medicine Collaborative research study, to provide the critical missing infrastructure required to enable clinical use of genome-informed medicine,” Megill said. “Doctors today have no easy way to order a genetic test, have the resulting sequence data stored in a trusted place for future use, and receive a ‘human readable’ report that can be used by doctors who haven’t been trained as geneticists.”

Coriell Life Sciences’ business model is based on an assumption that community healthcare providers will likely outsource genome sequencing and the storage of the data. “I don’t think you’re going to see the hospitals buying sequencing machines. It is rocket science and there are rocket scientists who are quite good at it,” Christman said. “So, the doctors will need the ability to collect blood and saliva and the access to FedEx. The sequence then needs to go somewhere.”

Furthermore, Coriell Life Sciences will provide doctors with options on the specific types of available data interpretation services.

“Ultimately, the sequence becomes a commodity supply to the interpretation. Doctors do not need to be educated in the value of an Illumina sequence versus a Complete Genomics sequence to order a specific interpretation,” a company spokesperson said. “Coriell Life Sciences will negotiate the best available supplier for sequence data on their behalf using stringent standards for quality and turnaround time.

“The key principle is making it easy for doctors to order tests and receive results that are ‘human readable’ – without needing to be a geneticist.”

IBM has provided technologies for Coriell Life Sciences and has invested an undisclosed amount in the company. Separate from this effort, Coriell is using IBM’s capabilities and systems to store the 1.5 gigabytes of information per person who has partaken in the Personalized Medicine Collaborative, which aims to genotype 100,000 people.

Megill, in line with other industry observers, believes that doctors are much more likely to use personalized treatment strategies if data from genomic testing were integrated into patients’ electronic medical records. In this regard, the partnership with IBM is critical, since IBM technologies are utilized in 75 percent of the world’s electronic medical record systems, he estimated.

Leveraging IBM’s integration and data interchange technologies, Coriell Life Sciences “will build bi-directional data integrations with healthcare systems so that tests can be ordered, phenotypic data can be utilized, and results can be delivered within the context of the patient record,” Megill said.

Coriell Life Sciences’ model is looking ahead to a time when having a whole genome sequence in medical care will be as commonplace as getting an annual physical exam, except one needs to get his genome sequenced only once. Several speakers at the conference in Mountain View discussed how the advent of whole genome sequencing will change patient care and the diagnostics market.

Describing a model very similar to the one being pursued by Coriell Life Sciences, Cliff Reid, CEO of sequencing firm Complete Genomics, discussed how in the future having whole genome sequence testing performed for a patient and then storing the data for future use will reduce the cost of genetic testing dramatically.

“There will be one cost up front [for whole genome sequencing]… and virtually free thereafter,” Reid said. “By storing it in a secure database, the cost of every genetic test after that is pennies and the time to get it is seconds.

“This is a radically different economic and usage profile than what we’re seeing today in the genetics industry,” he added. “This doesn’t fit very well in the current practice.”

Turna Ray is the editor of GenomeWeb’s Pharmacogenomics Reporter. She covers pharmacogenomics, personalized medicine, and companion diagnostics. E-mail Turna Ray or follow her GenomeWeb Twitter account at @PGxReporter.

Related Stories

SOURCE:

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Reporter and Curator: Dr. Sudipta Saha, Ph.D.

Disorders of sex development include many different medical conditions. They could happen to anyone, and are actually more common than you might think. You may have heard DSD called terms such as “intersex” or “hermaphrodite” or “pseudohermaphroditism.” However, a meeting of international experts reached consensus that the term “disorders of sex development” should replace those terms. Because there are so many stages of sex development in human life, there are a lot of opportunities for a person to develop along a path that is not the average one for a boy or a girl. When a less-common path of sex development is taken, the condition is often called a “disorder of sex development” or DSD. So DSD is a name given to a lot of different variations of sex development.

These conditions have specific names, and include:

  • 46,XX congenital adrenal hyperplasia (CAH)
  • Testosterone biosynthetic defects
  • Androgen insensitivity syndrome (AIS)—can be partial (PAIS) or complete (CAIS)
  • Gonadal dysgenesis (partial and complete)
  • Swyer syndrome (46,XY gonadal dysgenesis)
  • 5-alpha reductase deficiency (5-AR deficiency)
  • 46,XY micropenis
  • Klinefelter syndrome (47,XXY)
  • Turner syndrome (45,X)
  • Hypospadias
  • Epispadias
  • Mayer-Rokitansky-Kuster-Hauser syndrome (Also called MRKH, Müllerian agenesis and vaginal agenesis)
  • Sex-chromosome mosaicism (for example mixed gonadal dysgenesis (45,X/46,XY; sometimes referred to as XY Turners)
  • 46,XX/46,XY (chimeric, ovotesticular DSD)
  • Persistant Müllerian duct syndrome
  • Kallman syndrome
  • 17-beta reductase deficiency (XX or XY)
  • 46,XY 3-beta-hydroxysteroid dehydrogenase deficiency (HSD deficiency)
  • Aphallia
  • Clitoromegaly
  • 46,XY cloacal exstrophy
  • Progestin-induced virilization

The symptoms associated with intersex will depend on the underlying cause, but may include:

  • Ambiguous genitalia at birth
  • Micropenis
  • Clitoromegaly (an enlarged clitoris)
  • Partial labial fusion
  • Apparently undescended testes (which may turn out to be ovaries) in boys
  • Labial or inguinal (groin) masses — which may turn out to be testes — in girls
  • Hypospadias [the opening of the penis is somewhere other than at the tip; in females, the urethra (urine canal) opens into the vagina]
  • Otherwise unusual appearing genitalia at birth
  • Electrolyte abnormalities
  • Delayed or absent puberty
  • Unexpected changes at puberty

Disorders of sex development (DSD) with or without ambiguous genitalia require medical attention to reach a definite diagnosis. Advances in identification of molecular causes of abnormal sex, heightened awareness of ethical issues and this necessitated a re-evaluation of nomenclature. The term DSD was proposed for congenital conditions in which chromosomal, gonadal or anatomical sex is atypical. In general, factors influencing sex determination are transcriptional regulators, whereas factors important for sex differentiation are secreted hormones and their receptors.The current intense debate on the management of patients with intersexuality and related conditions focus on four major issues: 1) aetiological diagnosis, 2) assignment of gender, 3) indication for and timing of genital surgery, 4) the disclosure of medical information to the patient and his/her parents. The psychological and social implications of gender assignment require a multidisciplinary approach and a team which includes ageneticist, neonatologist, endocrinologist, gynaecologist, psychiatrist, surgeon and a social worker. Each patient should be evaluated individually by multidisciplinary approach.

Source References:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3184510/

http://en.wikipedia.org/wiki/Disorders_of_sex_development

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002634/

http://www.med.umich.edu/yourchild/topics/dsd.htm

http://www.accordalliance.org/dsd-guidelines.html

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State of the art in oncologic imaging of lungs.

Author and Curator: Dror Nir, PhD

This is the second post in a series in which I will address the state of the art in oncologic imaging based on a review paper; Advances in oncologic imaging that provides updates on the latest approaches to imaging of 5 common cancers: breast, lung, prostate, colorectal cancers, and lymphoma. This paper is published at CA Cancer J Clin 2012. © 2012 American Cancer Society.

The paper gives a fair description of the use of imaging in interventional oncology based on literature review of more than 200 peer-reviewed publications.

In this post I summaries the chapter on lung cancer imaging.

Lung Cancer Imaging

“Lung cancer remains the most common cause of death from cancer worldwide, having resulted in 1.38 million deaths (18.2% of all cancer deaths) in 2008.48 It also represents the leading cause of death in smokers and the leading cause of cancer mortality in men and women in the United States. In 2012, it was estimated that 226,160 new cases of lung cancer would be diagnosed (accounting for about 14% of cancer diagnoses) and that lung cancer would cause 160,340 deaths (about 29% of cancer deaths in men and 26% of cancer deaths in women) in the United States.1 The 1-year relative survival rate for the disease increased from 35% to 43% from 1975 through 1979 to 2003 through 2006.49 The 5-year survival rate is 53% for disease that is localized when first detected, but only 15% of lung cancers are diagnosed at this early stage.”

For cancer with such poor survival rates removal of the primary lesion by surgery at an early-stage disease is the best option. The current perception in regards to lung cancr is that patients may have subclinical disease for years before presentation. It is also known that early lung cancer lesions; adenocarcinoma in situ (AIS) and minimally invasive adenocarcinoma (MIA) are slow-growing, doubling time which can exceed 2 years.52 But, since at present, no lung cancer early-detection biomarker is clinically available, the diagnosis of this disease is primarily based on symptoms, and detection often occurs after curative intervention and when it’s already too late – see: Update on biomarkers for the detection of lung cancer and also Diagnosing lung cancer in exhaled breath using gold nanoparticles. Until biomarker is found, the burden of screening for this disease is on imaging.

“AIS and MIA generally appear as a single peripheral ground-glass nodule on CT. A small solid component may be present if areas of alveolar collapse or fibroblastic proliferation are present,5051 but any solid component should raise concern for a more invasive lesion (Fig. 8). Growth over time on imaging can often be difficult to assess due to the long doubling time of these AIS and MIA, which can exceed 2 years.52 However, indicators other than growth, such as air bronchograms, increasing density, and pleural retraction within a ground-glass nodule are suggestive of AIS or MIA.

CT image shows a ground glass nodule, which is the typical appearance of AIS, in the right upper lobe.

CT image shows a ground glass nodule, which is the typical appearance of AIS, in the right upper lobe.

 

CT (A) demonstrated extensive consolidation with air bronchograms in the left upper lobe, which at surgical resection were found to represent adenocarcinoma of mixed subtype with predominate (70%) mucinous bronchioloalveolar subtype. PET imaging in the same patient (B) demonstrated uptake in the lingula higher than expected for bronchioloalveolar carcinoma and probably due to secondary inflammation/infection. CT (C) obtained 3 years after images (A) and (B) demonstrated biopsy-proven recurrent soft-tissue mass near surgical site. Fused FDG/PET images (D) demonstrate no uptake in the area. This finding is consistent with the decreased uptake usually seen in tumors of bronchioloalveolar histology (new terminology of MIA).

CT (A) demonstrated extensive consolidation with air bronchograms in the left upper lobe, which at surgical resection were found to represent adenocarcinoma of mixed subtype with predominate (70%) mucinous bronchioloalveolar subtype. PET imaging in the same patient (B) demonstrated uptake in the lingula higher than expected for bronchioloalveolar carcinoma and probably due to secondary inflammation/infection. CT (C) obtained 3 years after images (A) and (B) demonstrated biopsy-proven recurrent soft-tissue mass near surgical site. Fused FDG/PET images (D) demonstrate no uptake in the area. This finding is consistent with the decreased uptake usually seen in tumors of bronchioloalveolar histology (new terminology of MIA).

In August 2011 the results of the “National Lung Screening Trial “ which was funded by the National Cancer Institute (NCI) were published in NEJM; Reduced Lung-Cancer Mortality with Low-Dose Computed Tomographic Screening. This randomized study results showed that with low-dose CT screening of high-risk persons, there was a significant reduction of 20% in the mortality rate from lung cancer as compared to chest radiographs screening.

Based on these results one can find the following information regarding Lung Cancer Screening on the NCI web-site:

Three screening tests have been studied to see if they decrease the risk of dying from lung cancer.

The following screening tests have been studied to see if they decrease the risk of dying from lung cancer:

  • Chest x-ray: An x-ray of the organs and bones inside the chest. An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body.
  • Sputum cytology: Sputum cytology is a procedure in which a sample of sputum (mucus that is coughed up from the lungs) is viewed under a microscope to check for cancer cells.
  • Low-dose spiral CT scan (LDCT scan): A procedure that uses low-dose radiation to make a series of very detailed pictures of areas inside the body. It uses an x-ray machine that scans the body in a spiral path. The pictures are made by a computer linked to the x-ray machine. This procedure is also called a low-dose helical CT scan.

Screening with low-dose spiral CT scans has been shown to decrease the risk of dying from lung cancer in heavy smokers.

A lung cancer screening trial studied people aged 55 years to 74 years who had smoked at least 1 pack of cigarettes per day for 30 years or more. Heavy smokers who had quit smoking within the past 15 years were also studied. The trial used chest x-rays or low-dose spiral CT scans (LDCT) scans to check for signs of lung cancer.

LDCT scans were better than chest x-rays at finding early-stage lung cancer. Screening with LDCT also decreased the risk of dying from lung cancer in current and former heavy smokers.

Guide is available for patients and doctors to learn more about the benefits and harms of low-dose helical CT screening for lung cancer.

Screening with chest x-rays or sputum cytology does not decrease the risk of dying from lung cancer.

Chest x-ray and sputum cytology are two screening tests that have been used to check for signs of lung cancer. Screening with chest x-ray, sputum cytology, or both of these tests does not decrease the risk of dying from lung cancer.

The authors of Advances in oncologic imaging found out that for pre-treatment staging and post treatment follow-up of lung cancer patients mainly involves CT (preferably contrast enhanced, FDG PET and PET/CT. “Integrated PET/CT has been found to be more accurate than PET alone, CT alone, or visual correlation of PET and CT for staging NSCLC (Non-small-cell lung carcinoma).59 “

The standard treatment of choice for localized disease remains surgical resection with or without chemo-radiation therapy (stage dependant). “The current recommendations for routine follow-up after complete resection of NSCLC are as follows: for 2 years following surgery a contrast-enhanced chest CT scan every 4 to 6 months and then yearly non-contrast chest CT scans.62 Detection of recurrence on CT is the primary goal in the initial years, and therefore, optimally, a contrast-enhanced scan should be obtained to evaluate the mediastinum. In subsequent years, when identifying an early second primary lung cancer becomes of more clinical importance, a non-contrast CT chest scan suffices to evaluate the lung parenchyma.

CT (A) of 78-year-old male who was status post–left lobe lobectomy and left upper lobe wedge resection shows recurrent nodule at the surgical resection site. Fused PET/CT (B) demonstrates increased [18F]FDG uptake in the corresponding nodule at the surgical resection site consistent with recurrent tumor.

CT (A) of 78-year-old male who was status post–left lobe lobectomy and left upper lobe wedge resection shows recurrent nodule at the surgical resection site. Fused PET/CT (B) demonstrates increased [18F]FDG uptake in the corresponding nodule at the surgical resection site consistent with recurrent tumor.

In patients undergoing chemotherapies: “ [18F]FDG PET response correlates with histologic response.63 [18F]FDG PET scan data can provide an early readout of response to chemotherapy in patients with advanced-stage lung cancer.64

In patients treated by recently developed “Targeted Therapies” such as Radiofrequency ablation (RFA) the authors found out that PET/CT is the preferred imaging modality for post treatment follow-up.

“ Most patients treated with pulmonary ablation will have had a pre-procedure CT or a fusion PET/CT scan, which allows more precise anatomic localization of abnormalities seen on PET. Generally, either CT or PET/CT is performed within a few weeks of the procedure to provide a new baseline to which future images can be compared to assess for changes in size, degree of enhancement or [18F]FDG avidity.67

CT (A) demonstrates new left upper lobe mass representing new primary NSCLC in a patient who had a status post–right pneumonectomy for a prior NSCLC. CT (B) obtained in the same patient 2 weeks after radiofrequency ablation (RFA) demonstrates the postablation density in the left upper lobe. Fused PET/CT (C) obtained 4 months after RFA demonstrates mild [18F]FDG uptake at RFA site in the left upper lobe consistent with posttreatment inflammation. Fused PET/CT (D) obtained 7 months after RFA demonstrates new focal [18F]FDG uptake at post-RFA-opacity consistent with recurrent tumor.

CT (A) demonstrates new left upper lobe mass representing new primary NSCLC in a patient who had a status post–right pneumonectomy for a prior NSCLC. CT (B) obtained in the same patient 2 weeks after radiofrequency ablation (RFA) demonstrates the postablation density in the left upper lobe. Fused PET/CT (C) obtained 4 months after RFA demonstrates mild [18F]FDG uptake at RFA site in the left upper lobe consistent with posttreatment inflammation. Fused PET/CT (D) obtained 7 months after RFA demonstrates new focal [18F]FDG uptake at post-RFA-opacity consistent with recurrent tumor.

Prostate Cancer Imaging

To be followed…

Other research papers related to the management of Lung cancer were published on this Scientific Web site:

Diagnosing lung cancer in exhaled breath using gold nanoparticles

Lung Cancer (NSCLC), drug administration and nanotechnology

Non-small Cell Lung Cancer drugs – where does the Future lie?

Comprehensive Genomic Characterization of Squamous Cell Lung Cancers

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State of the art in oncologic imaging of breast.

Author-Writer: Dror Nir, PhD

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Word Cloud By Danielle Smolyar

In the coming posts I will address the state of the art in oncologic imaging based on a review paper; Advances in oncologic imaging that provides updates on the latest approaches to imaging of 5 common cancers: breast, lung, prostate, colorectal cancers, and lymphoma. This paper is published at CA Cancer J Clin 2012. © 2012 American Cancer Society.

The paper gives a fair description of the use of imaging in interventional oncology based on literature review of more than 200 peer-reviewed publications.

In this post I summaries the chapter on breast cancer imaging.

Breast Cancer Imaging

As a start the authors describes the evolution in the ACS imaging guidelines for breast cancer screening. Most interesting to learn is how age limits are changing. The most recent: “In 2010, the Society of Breast Imaging and the Breast Imaging Commission of the ACS issued recommendations for breast cancer screening to provide guidance in light of the controversies and emerging technologies.5 These recommendations were based on multiple prospective randomized trials as well as population-based experience.

Recommendations for screening with non-mammographic imaging are based not on evidence showing mortality reduction but largely on surrogate indicators, i.e., tumor size and nodal status, suggesting improved survival compared with women who are not screened.” I have referred to these guidelines in my recent post: Not applying evidence-based medicine drives up the costs of screening for breast-cancer in the USA.

As long as imaging interpretation is based mainly on observations related to lesion morphology:

“The imaging characteristics of malignant lesions are nonspecific and usually do not allow a definitive diagnosis. When a biopsy is recommended based on mammography, it has a 25% to 45% likelihood of resulting in a diagnosis of carcinoma.11 Similar positive predictive values are reported for biopsies recommended based on MRI.”

It is worthwhile noting that these results do not reflect purely the specificity of the imaging device but rather the specificity of the whole workflow; i.e imaging, biopsy and histopathology. All imaging techniques have false negatives: Mammography screening of general population misses approximately 20% of the cancers. This rate increases as breast density increases. MRI is not applied to general population. When applied to highly suspicious cases MRI misses ~10% of the invasive cancers. Although ultrasound has proven to be useful in detecting cancer especially in women with dense breasts: Automated Breast Ultrasound System (‘ABUS’) for full breast scanning: The beginning of structuring a solution for an acute need! Based on the literature reviewed by the authors of this paper they do not recommend routine sonography for these women.

For women with locally advanced breast cancer (Fig. 2) who undergo neoadjuvant therapy before breast surgery, the authors recommends post-treatment staging using MRI, which has been found to predict complete response with sensitivity above 60% and specificity as high as 90%.26

A 27-year-old female with locally advanced poorly differentiated invasive ductal carcinoma underwent evaluation of extent of disease before starting neoadjuvant chemotherapy. Sagittal fat-suppressed T1-weighted postcontrast MR images demonstrate an almost 6-cm heterogeneously enhancing mass (A) involving the skin of the lower breast (arrow) with (B) right axillary (arrow) and (C) right internal mammary adenopathy (arrow).

A 27-year-old female with locally advanced poorly differentiated invasive ductal carcinoma underwent evaluation of extent of disease before starting neoadjuvant chemotherapy. Sagittal fat-suppressed T1-weighted postcontrast MR images demonstrate an almost 6-cm heterogeneously enhancing mass (A) involving the skin of the lower breast (arrow) with (B) right axillary (arrow) and (C) right internal mammary adenopathy (arrow).

Same is recommended for women who have undergone lumpectomy if the surgical margins are positive. As post therapy follow-up, a new baseline mammogram of the treated breast is recommended followed by annual mammography.

In regards to emerging technology the following are discussed: Mammographic tomosynthesis – see also Improving Mammography-based imaging for better treatment planning

Contrast-enhanced digital mammography – “involves the injection of iodinated contrast material, as is done for computed tomography (CT); this enables hypervascular lesions to be seen with modified mammography technology, potentially providing the same information obtained through MRI. Little has been published on the clinical application of this technology, but diagnostic accuracy better than that of mammography and approaching that of MRI has been reported.3132

MR choline spectroscopy – has been shown to improve the positive predictive value of breast MRI and may be useful in reducing the number of lesions that require biopsy (Fig. 4).33 Studies of spectroscopy have reported sensitivities of 70% to 100% and specificities of 67% to 100% in the detection of breast cancer. Decreasing choline concentrations may also be a useful indication of tumor response to treatment before any change in tumor volume can be detected.3435 Technical factors have limited the use of spectroscopy to lesions 1 cm in size or larger.”

Sagittal fat-suppressed T1-weighted postcontrast MR image is shown (A) of the right breast of a 48-year-old female who was status post–contralateral mastectomy for DCIS with the spectroscopy voxel placed over an enhancing mass (arrow). The magnified spectrum (B) demonstrated no choline peak. Biopsy yielded fibroadenoma.

Sagittal fat-suppressed T1-weighted postcontrast MR image is shown (A) of the right breast of a 48-year-old female who was status post–contralateral mastectomy for DCIS with the spectroscopy voxel placed over an enhancing mass (arrow). The magnified spectrum (B) demonstrated no choline peak. Biopsy yielded fibroadenoma.

Diffusion-weighted MRI (DW-MRI) – “adding DW-MRI data to other imaging characteristics of lesions on breast MRI may increase the positive predictive value of the examination, in turn decreasing the number of benign lesions requiring biopsy for diagnosis.” See also Imaging: seeing or imagining? (Part 2).

Axial T1-weighted fat-suppressed postcontrast MR image is shown (A) of the left breast of a 42-year-old female with biopsy-proven contralateral cancer undergoing evaluation of disease extent. An enhancing mass (arrow) was seen in the left breast. This mass (arrow) was also demonstrated on the axial diffusion-weighted MR image (B). Biopsy yielded fibroadenoma with atypical ductal hyperplasia and lobular carcinoma in situ.

Axial T1-weighted fat-suppressed postcontrast MR image is shown (A) of the left breast of a 42-year-old female with biopsy-proven contralateral cancer undergoing evaluation of disease extent. An enhancing mass (arrow) was seen in the left breast. This mass (arrow) was also demonstrated on the axial diffusion-weighted MR image (B). Biopsy yielded fibroadenoma with atypical ductal hyperplasia and lobular carcinoma in situ.

Ultrasound-elastography – “Ultrasound elastography has been reported to differentiate benign from malignant breast lesions with sensitivities of 78% to 100% and specificities of 21% to 98%.39 When added to other US techniques, it may improve radiologists’ performance in distinguishing malignant breast lesions.”

Positron emission tomography (PET) – “alone or combined with CT, allows noninvasive, quantitative assessment of biochemical and functional processes at the molecular level in the body. It is most often performed with the radiolabeled glucose analogue [18F] fluorodeoxyglucose ([18F]FDG) to detect the elevated glucose metabolism that is a hallmark of cancer. In breast cancer, its utility depends on the pretest probability for advanced disease, and thus the clinical stage.” The authors found that the use of [18F] FDG PET to patients with stage I and II disease is “limited”. Specifically, they claim that it is not sufficiently accurate for axillary nodal staging in this subset of patients.40 The did find enough evidence to recommend the use of FDG PET in patients with advanced disease: “where it accurately defines disease extent,41 and frequently eliminates the need for other imaging tests, and provides an early readout of treatment response as well as prognostic information.”

Combined PET/MRI is mentioned as a promising technology for predicting response to therapy “but this remains to be proven”.

Positron emission mammography (PEM) – “adapts full-body PET imaging to the breast. In a multicenter study, the interpretation of PEM in conjunction with mammographic and clinical findings yielded a sensitivity of 91% and a specificity of 93% for breast cancer.47 “. However, the authors mention that its use for screening (applying to healthy women) has been criticized because of the need to administer a radioactive tracer.

Lung Cancer Imaging

To be followed…

Other research papers related to the management of breast cancer were published on this Scientific Web site:

The unfortunate ending of the Tower of Babel construction project and its effect on modern imaging-based cancer patients’ management

 Automated Breast Ultrasound System (‘ABUS’) for full breast scanning: The beginning of structuring a solution for an acute need!

Introducing smart-imaging into radiologists’ daily practice.

Will Bio-Tech make Medical Imaging redundant?

Improving Mammography-based imaging for better treatment planning

Not applying evidence-based medicine drives up the costs of screening for breast-cancer in the USA.

New Imaging device bears a promise for better quality control of breast-cancer lumpectomies – considering the cost impact

Harnessing Personalized Medicine for Cancer Management, Prospects of Prevention and Cure: Opinions of Cancer Scientific Leaders @ http://pharmaceuticalintelligence.com

Predicting Tumor Response, Progression, and Time to Recurrence

“The Molecular pathology of Breast Cancer Progression”

Personalized medicine gearing up to tackle cancer

Whole-body imaging as cancer screening tool; answering an unmet clinical need?

What could transform an underdog into a winner?

Mechanism involved in Breast Cancer Cell Growth: Function in Early Detection & Treatment

Nanotech Therapy for Breast Cancer

A Strategy to Handle the Most Aggressive Breast Cancer: Triple-negative Tumors

Optical Coherent Tomography – emerging technology in cancer patient management

Breakthrough Technique Images Breast Tumors in 3-D With Great Clarity, Reduced Radiation

Closing the Mammography gap

Imaging: seeing or imagining? (Part 1)

Imaging: seeing or imagining? (Part 2)

 

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Reporter and Curator: Dr. Sudipta Saha, Ph.D.

Hypopituitarism is a partial or complete insufficiency of pituitary hormone secretion that may be derived from pituitary or hypothalamic disease. Onset can be at any time of life. Intrinsic pituitary disease, or any process that disrupts the pituitary stalk or damages the hypothalamus, may produce pituitary hormone deficiency. The clinical presentation of hypopituitarism widely varies, depending on patient age and on the specific hormone deficiencies, which may occur singly or in various combinations. As a general rule, diagnosis of a single pituitary hormone deficiency requires evaluating the other hormone axes.

Etiology

Hypopituitarism has multiple possible etiologies either from congenital or acquired mechanisms. The common endpoint is disrupted synthesis or release of 1 or more pituitary hormones, resulting in clinical manifestations of hypopituitarism. Genetic causes of hypopituitarism are relatively rare. However, research since the late 20th century has brought considerable advances in the understanding of the various genetic causes of congenital hypopituitarism. Inheritance patterns may be autosomal recessive, autosomal dominant, or X-linked recessive. The phenotype and severity of clinical findings in congenital hypopituitarism are determined by the specific genetic mutation. Causes of hypopituitarism can be divided into categories of congenital and acquired causes.

Congenital causes of hypopituitarism include the following:

  • Perinatal insults (eg, traumatic delivery, birth asphyxia)
  • Interrupted pituitary stalk
  • Absent or ectopic neurohypophysis
  • Pallister-Hall syndrome

Multiple Pituitary Hormone Deficiency is rare in childhood, with a possible incidence of fewer than 3 cases per million people per year. The most common pituitary hormone deficiency, growth hormone deficiency (GHD), is much more frequent; a US study reported a prevalence of 1 case in 3480 children.A 2001 population study in adults in Spain estimated the annual incidence of hypopituitarism at 4.2 cases per 100,000 population. Because hypopituitarism has congenital and acquired forms, the disease can occur in neonates, infants, children, adolescents, and adults.

Prognosis

With appropriate treatment, the overall prognosis in hypopituitarism is very good. Sequels from episodes of severe hypoglycemia, hypernatremia, or adrenal crises are among potential complications. Long-term complications include short stature, osteoporosis, increased cardiovascular morbidity/mortality, and infertility. Previous findings of increased cardiovascular morbidity and decreased life expectancy in adults with hypopituitarism were thought to be largely secondary to untreated GHD.

Mortality/morbidity

Morbidity and mortality statistics generally cannot be viewed in isolation but must instead be related to the underlying cause of hypopituitarism. For example, morbidity and mortality are minimal in the context of idiopathic GHD compared with hypopituitarism caused by craniopharyngioma. Recognition of pituitary insufficiency and appropriate hormone replacement (including stress doses of hydrocortisone, when indicated) are essential for the avoidance of unnecessary morbidity and mortality. Clinical manifestations of isolated or multiple deficiencies in pituitary hormones (anterior and/or posterior) can result in significant sequelae that include any of the following:

  • Hypoglycemia – Can cause convulsions; persistent, severe hypoglycemia can cause permanent CNS injury.
  • Adrenal crisis – Can occur during periods of significant stress, from ACTH or CRH deficiency; symptoms include profound hypotension, severe shock, and death.
  • Short stature – Can have significant psychosocial consequences.
  • Hypogonadism and impaired fertility – From gonadotropin deficiency
  • Osteoporosis – Results in increased fracture risk

GHD is believed to be an important contributing factor to morbidity and mortality associated with hypopituitarism. In a 2008 study, childhood onset GHD was associated with an increased hazard ratio for morbidity of greater than 3.0 for males and females. Causes of morbidity and mortality are multifactorial and relate to the specific cause of hypopituitarism, as well as to the degree of pituitary hormone deficiency.

Source References:

http://tbccn.org/CCJRoot/v9n3/pdf/212.pdf

http://emedicine.medscape.com/article/922410-overview

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