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Biomarker tool development for Early Diagnosis of Pancreatic Cancer: Van Andel Institute and Emory University

Reporter: Aviva Lev-Ari, PhD, RN

Van Andel, Emory to Develop Early Pancreatic Cancer Dx

October 19, 2012
 

NEW YORK (GenomeWeb News) – Van Andel Institute and Emory University researchers will use a $2.3 million grant from the National Cancer Institute to fund an effort to develop new biomarker tools that can aid in the early diagnosis of pancreatic cancer.

The Van Andel and Emory team plan to use gene expression studies and a shotgun glycomics approach to try to develop useful diagnostic tests for a certain carbohydrate structure that is prevalent in most, but not all, pancreatic cancer tumors.

In a shotgun glycomics approach, all of the glycans from a sample are tagged with a fluorescent tag and separated from each other to create a tagged glycolipid library. This library will be developed through gene expression studies on the tumor tissue.

“One of the most common features of pancreatic cancers is the increased abundance of a carbohydrate structure called the CA 19-9 antigen,” Brian Haab, head of Van Andel’s Laboratory of Cancer Immunodiagnostics, said in a statement.

Because CA 19-9 is attached to many different proteins that the tumor secretes into the blood it is used to confirm diagnosis of and to manage disease progression of pancreatic cancer. Tests for this structure have not yet been useful for early detection or diagnosis, however, because around 20 to 30 percent off incipient tumors produce low levels of CA 19-9.

“The low levels are usually due to inherited genetic mutations in the genes responsible for the synthesis of CA 19-9,” Haab explained. “However, patients who produce low CA 19-9 produce alternate carbohydrate structures that are abnormally elevated in cancer.”

This study aims to characterize and identify these glycans to improve the ability to detect cancer in patients with low CA 19-9 levels.

The research will integrate the use affinity reagents, a type of proteins called lectins, as well as shotgun glycomics, to detect these glycan structures and develop a diagnostic test for pancreatic cancer.

Because pancreatic cancer tends to spread before it is diagnosed and because of its resistance to chemotherapy, it has one of the lowest survival rates of any major cancer. It will affect more than 43,000 Americans in 2012 and will kill more than 37,000, according to NCI.

“We anticipate these new approaches advancing pancreatic cancer diagnostics as well as benefiting other glycobiology research in cancer,” Haab said.

Researchers from the Fred Hutchinson Cancer Research Center, Palo Alto Research Center, the University of Georgia, and the University of Pittsburgh Medical Center also are participating in the project.

 

 

 

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Reporter: Aviva Lev-Ari, PhD, RN

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Former FDA Chief on Modernizing Drug and Device Approvals

Introduction

John C. Reed, MD, PhD: Hello, and welcome to Medscape One-on-One. I’m Dr. John Reed, Professor and CEO of Sanford-Burnham Medical Research Institute. Joining me today at the Celebration of Science Conference at the National Institutes of Health (NIH) is Andrew C. von Eschenbach, President of Samaritan Health Initiatives, former Commissioner of the US Food and Drug Administration (FDA), and former Director of the National Cancer Institute (NCI). Welcome.

Andrew C. von Eschenbach, MD: Great to be with you.

The Collaboration of Government, Industry, and Academia

Dr. Reed: At this conference, you spoke about the interaction of government, industry, and academic centers. The relationship among these 3 entities is often challenging, but also crucial to the advancement of science. Can you give us a couple of examples how these partnerships are working well, and also some ideas of how we can improve collaboration among these groups?

Dr. von Eschenbach: I think we both appreciate that caring for patients, solving their problems, and curing their diseases is a team sport. We all have a part and a role to play in this. Government, academia, industry — we need to come together to figure out how to create these comprehensive systematic solutions to problems.

It starts with discovery. Academic centers and researchers like you are really revealing the mysteries of the underlying mechanisms of these diseases, and are making it possible for industry to start creating and developing solutions and interventions that can target those mechanisms and alter the outcome of those diseases — whether it’s eliminating suffering and death due to cancer or solving the problem of Alzheimer disease.

Government has to play a critical role in catalyzing and fostering that collaboration. A great example of where I saw this occurred was when I was at the NCI. When I looked at the government’s investment following the National Cancer Act in 1971, which enabled the NCI to create cancer centers, I could see 65 cancer centers all over this country. But what I also saw was that around these centers, there were these clusters of state-of-the-art care. There were these clusters of emerging biotechnology and the pharmaceutical industry coming together and creating an ecosystem that would be able to go from discovery and development to delivery.

Another great example is the state of Georgia, which did not have a cancer center at that time. But the state took money from the tobacco settlement, put it into a private endowment, and went about the business of creating the Winship Cancer Institute at Emory University in Atlanta. That attracted a united effort, including government funding from our cancer nanotechnology initiative. It brought in other academic institutions, such as Georgia Tech, and even private philanthropy from such institutions as Home Depot, for example.

We can make this work. We can bring the parts and pieces together as a team to use the brilliance of the science that you, Dr. Reed, have been doing, and others here at NIH and in academic institutions all around the world have been doing, and recognize that science is the means. The end is that we solve people’s problems, and we do it together.

Translating Life-Science Advancements Into Disease Cures and Prevention

Dr. Reed: That’s a great example of the catalytic role that government funding can play in economic development as well as advancing healthcare. You gave the example of Georgia. We’ve seen the same thing happen in the state of Florida, where tobacco settlement monies were used to create a seed investment. That spawned additional development of hospitals, and a government investment that turned a couple hundred jobs into tens of thousands of jobs for the state.

Let me change subjects. You were previously involved in laboratory and clinical research. Can you talk about how advancements in the field of life sciences are paving the way for possible cures and preventions for such diseases as prostate cancer? You used to be an urologist, and prostate cancer is a disease you worked on a lot. There are also neurodegenerative diseases, such as Alzheimer’s disease, which we’re all worried about. What are you excited about in these areas?

Dr. von Eschenbach: If I get a chance to talk to students and they ask what they should do in life, I tell them this is the most exciting time to go into medicine. And we are in the midst of the most profound transformation to ever occur in history in medicine going all the way back to Hippocrates. Throughout the history of medicine, physicians such as myself have been practicing a model based on our observations of the manifestations of disease.

I feel a lump in a woman’s breast. I see a shadow on a chest x-ray. I’m seeing the manifestations of an underlying disease, but it tells me nothing about what to do about it. All of our therapies and all of the things that we do about those observations have been empiric. Today we’re going from observing manifestations to actually understanding the mechanisms of the disease. We’re beginning to recognize the genes, the molecules, and the cellular processes that are responsible for and driving those disease processes. Once we have that knowledge of an underlying mechanism, it intuitively leads us to what the right solution is, to intervene in that mechanism and alter the outcome of that process.

Cancer, for example, is a disease process. It begins with our susceptibility, and that process ends with unfortunate suffering and death. But there are all these steps in between, and you have contributed personally to understanding some of those fundamental mechanisms.

Now physicians can be strategic. We can intervene in that process in a strategic way. Call it “personalized medicine” if you will. Get the right intervention for the right reason to the right patient at the right time, and you can prevent that process from happening. You can detect disease very early. You can eliminate it, or you can modulate and change its behavior and its outcome. You can alter the slope of the curve and allow patients to live the rest of their life never threatened by it.

This is the new frontier for medicine and for physicians. We will enter into this frontier with tools that we never had before. We can visualize biology with new imaging. We now have new therapies that are becoming available to us that will alter and change disease in radical ways. No longer is it just for cancer, surgery, chemotherapy, and radiation. The future for physicians is the most exciting, and yet it is a future that we have to grasp.

Dr. Reed: As a former director of the NCI, do you see a day where cancer patients will be treated not on the basis of whether their cancer arose in the lung or the colon, or the prostate, but on the basis of the underlying genetics of the cancer? By matching the mutations to the medicine — is that how you think it will look in the future?

Dr. von Eschenbach: Absolutely. We’ve been immersed in categorizing diseases on the basis of what we could observe, what we could see. We call something “breast cancer” because we feel a lump in a woman’s breast, or we call something “lung cancer” because it’s in the lung.

But now, as we’re looking at these underlying mechanisms, guess what? We’re finding out that some subsets of lung cancer look exactly like another kind of cancer. And therefore, from that point of view, they have the same treatment. You can use a drug for chronic myelogenous leukemia and it works exceedingly well in gastrointestinal stroma, tumors of the stomach, as well. Even more important, we understand a mechanism for cancer based on angiogenesis in the abnormal growth of blood vessels. We develop a drug for that to retard or slow down the cancer, and it turns out it’s one of the most effective drugs for macular degeneration of the eye.

For physicians and for those of us who are practicing medicine, we’re going to see disease through a different prism. When we see it through that different prism, we’re going to be able to see new ways of conquering many diseases. Cancer is just the lead here. But we’re going to be seeing the same kinds of dramatic changes and breakthroughs in neurocognitive diseases, diabetes, and cardiovascular disease along the way.

We’re also seeing it disseminate very rapidly. It’s no longer centers and then community practice. We’re seeing the opportunity now with new technologies even outside of medicine. We now have information technologies that will help us see a full continuum for every patient. It will mean absolutely state-of-the-art care by every physician, regardless of where you’re located.

Speeding Drug and Device Approvals

Dr. Reed: For these exciting new therapies to come to reality, they have to be approved by the FDA. You are a former commission of the FDA. Some clinicians are frustrated with the time it takes to get new medical devices and drugs approved by the FDA. You’ve been more sympathetic to the agency and the lack of resources it has to help it through a mighty tough job.

What do you think we should be doing — either the American people or the federal government — to better support the FDA and its efforts to get much needed treatments to patients more quickly?

Dr. von Eschenbach: The importance of the FDA can’t be overemphasized. It’s absolutely critical to this entire process of progress that I’ve been talking about. Let’s go back to our model of discovery, development, and delivery enterprise in medicine. It’s no longer linear — from the bench to the bedside. It’s actually circular.

What we’re seeing in terms of physicians delivering care is that there are tools that are now available to help us better understand the human biology of disease. When we treat disease or intervene in a human being, through functional imaging or whatever, it is actually a discovery platform making this process circular.

The success of the process of discovery, development, and delivery is going to be based on speed. How quickly can we do that? How quickly can we keep cycling that revolution of knowledge and intervention? At the hub of that wheel is the FDA. It can be the brake, or it can be the accelerator. It clearly is critical to how rapidly we’re going to be able to move from your brilliant discovery in the laboratory to the point where we’ve actually made a difference in a patient’s life.

Regulation has to be modernized. It’s a matter of making sure that the agency has the capacity and the capability. Funding resources are critically important. But what’s more important is we need a new way of doing business. We can no longer use a regulatory process and framework that served us well in the 20th century, but is woefully inadequate for this new reality in the 21st century.

For physicians, especially physicians out in the community, a simple piece of that equation is that we will play a critically important role in the perspective of clinical trials. The way we approve drugs now in phase 1, phase 2, and phase 3 of clinical trials is not commensurate with the mechanistic view of disease. So we’re going to change the FDA. And in doing so, we’re going to fulfill the promise for people.

Dr. Reed: We’re excited to hear that. At the Celebration of Science Conference, we heard a representative from the FDA, Janet Woodcock, talking about that very issue of having more adaptable clinical trial designs. That is an opportunity for us to increase the speed of learning and turnover with real-time feedback from imaging and biomarkers, which allows us to see whether the medicine is working.

Dr. von Eschenbach: The FDA has to practice regulation in the way that physicians practice medicine. Every patient, first of all, wants personalized medicine. They all want to know what’s right and what’s best for me. Doctor, what should I do? We now have the tools to become much more precise about that.

But every patient, also in a way, becomes their own experiment. We apply a therapy, and a rational physician makes a very sophisticated educated guess but never knows whether it’s actually going to work in that one patient. We monitor, and when we observe outcomes, we change. We alter the treatment until we get to that desired outcome.

Why don’t we approve drugs that way? Why don’t we use adaptive trial designs so that we learn as we go, and do that routinely rather than using this stepwise fashion that we’ve been locked into? We have to be open to change.

Promising New Methods of Treating Disease

Dr. Reed: You were once a practicing urologist, and you went on to become director of the NCI. In recent years, you’ve been active in a number of organizations dedicated to researching and developing new methods of treating a variety of diseases. Tell us one of the things that you’re most looking forward to.

Dr. von Eschenbach: Cancer had the opportunity to be at the forefront and the vanguard of this radical transformation. In 1970, cancer was a disease that was devastating us with regard to the human toll of suffering and death, and the economic consequences. At that time, the science of cancer was just beginning to become apparent in a way that we could begin to understand the cancer cell and the living normal cell at its very fundamental genetic and molecular level. That created this enormous cascade of progress.

What we’re seeing now is that the lessons learned and the progress made in cancer can now be disseminated to all the other diseases. For example, Alzheimer disease and neurocognitive and neurologic disorders are probably today where cancer was in 1970. Those diseases have a huge, devastating impact on human life and will bankrupt us in terms of the overall cost of healthcare and the cost of caring for patients affected by these diseases. But science is now emerging to help us better understand these diseases.

It’s a privilege to have lived the life of a cancer physician and researcher, and now I can transpose that experience to ask how we can do that for all diseases. That’s my passion today; it’s not just about cancer. It’s no longer cancer-centric, but it is cancer-led. Everyone will profit from the tremendous progress that researchers are making in the science that we will translate into cures for people.

Dr. Reed: Dr. von Eschenbach, thank you for joining us today. For Medscape One-on-One, I’m John Reed.

http://www.medscape.com/viewarticle/771952?src=ptalk

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Reporter: Prabodh Kandala, PhD.

Researchers from Brigham and Women’s Hospital (BWH) have made a groundbreaking discovery that will shape the future of melanoma therapy. The team, led by Thomas S. Kupper, MD, chair of the BWH Department of Dermatology, and Rahul Purwar, PhD, found that high expression of a cell-signaling molecule, known as interleukin-9, in immune cells inhibits melanoma growth.

After observing mice without genes responsible for development of an immune cell called T helper cell 17 (TH17), researchers found that these mice had significant resistance to melanoma tumor growth, suggesting that blockade of the TH17 cell pathway favored tumor inhibition. The researchers also noticed that the mice expressed high amounts of interleukin-9.

“These were unexpected results, which led us to examine a possible contribution of interleukin-9 to cancer growth suppression.” said Purwar.

The researchers next treated melanoma-bearing mice with T helper cell 9 (TH9), an immune cell that produces interleukin-9. They saw that these mice also had a profound resistance to melanoma growth. This is the first reported finding showing an anti-tumor effect of TH9 cells.

Moreover, the researchers were able to detect TH9 cells in both normal human blood and skin, specifically in skin-resident memory T cells and memory T cells in peripheral blood mononuclear cells. In contrast, TH9 cells were either absent or present at very low levels in human melanoma. This new finding paves the way for future studies that will assess the role of interleukin-9 and TH9 cells in human cancer therapy.

“Immunotherapy of cancer is coming of age, and there have been exciting recent results in patients with melanoma treated with drugs that stimulate the immune system,” said Kupper. “We hope that our results will also translate to the treatment of melanoma patients, but much work still needs to be done.”

According to the researchers, other cell-signaling molecules have been used in treating melanoma; however, this study is the first to investigate the role of interleukin-9 in melanoma tumor immunity.

Melanoma is the most dangerous form of skin cancer. The National Cancer Institute estimates that in 2012, there will be more than 76,000 new cases of melanoma in the United States and 9,180 deaths. Melanoma is curable if recognized and treated early.

Abstract:

Interleukin-9 (IL-9) is a T cell cytokine that acts through a γC-family receptor on target cells and is associated with inflammation and allergy. We determined that T cells from mice deficient in the T helper type 17 (TH17) pathway genes encoding retinoid-related orphan receptor γ (ROR-γ) and IL-23 receptor (IL-23R) produced abundant IL-9, and we found substantial growth inhibition of B16F10 melanoma in these mice. IL-9–blocking antibodies reversed this tumor growth inhibition and enhanced tumor growth in wild-type (WT) mice. Il9r−/− mice showed accelerated tumor growth, and administration of recombinant IL-9 (rIL-9) to tumor-bearing WT and Rag1−/− mice inhibited melanoma as well as lung carcinoma growth. Adoptive transfer of tumor-antigen–specific TH9 cells into both WT and Rag1−/− mice suppressed melanoma growth; this effect was abrogated by treatment with neutralizing antibodies to IL-9. Exogenous rIL-9 inhibited tumor growth in Rag1−/− mice but not in mast-cell–deficient mice, suggesting that the targets of IL-9 in this setting include mast cells but not T or B cells. In addition, we found higher numbers of TH9 cells in normal human skin and blood compared to metastatic lesions of subjects with progressive stage IV melanoma. These results suggest a role for IL-9 in tumor immunity and offer insight into potential therapeutic strategies.

Ref:

http://www.sciencedaily.com/releases/2012/07/120708162314.htm.

http://www.nature.com/nm/journal/vaop/ncurrent/full/nm.2856.html

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Reporter: Prabodh Kandala, PhD.

A study has identified microRNA-3151 as a new independent prognostic marker in certain patients with acute leukemia. The study involves patients with acute myeloid leukemia and normal-looking chromosomes(CN-AML).

The study by researchers at the Ohio State University Comprehensive Cancer Center — Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC — James) found that when microRNA-3151 (miR-3151) is overexpressed in CN-AML, the disease responds poorly to treatment and patients experience shorter remissions and survival periods. This effect is independent of other gene mutations that may be present in the cells.

Additionally, miR-3151 is encoded within a gene called BAALC, which itself is an independent marker of poor survival when overexpressed in CN-AML.

The findings, published online in the journal Blood (and as a Plenary paper which represents the top 1 to 5 percent of papers published in the print edition of Blood), provide new insights into the nature of AML and might in the future help determine the best therapy for individual patients and further personalize AML therapy.

“Patients with high levels of both miR-3151 and BAALC had the poorest outcome compared with those showing high expression of either miR-3151 or BAALC alone, or those expressing low levels of both,” says principal investigator Dr. Clara D. Bloomfield, a Distinguished University Professor at Ohio State and cancer scholar and senior advisor to the OSUCCC — James. “This suggests that miR-3151 and BAALC may act through different mechanisms to enhance poor outcome of CN-AML patients.”

The study involved 179 patients aged 60 years or older with CN-AML who were treated on Cancer and Leukemia Group B (CALGB) clinical trials.

MicroRNAs are small molecules that cells use to help regulate the kinds and amount of proteins they make. About one-third of human microRNAs are encoded within host genes. Specifically, they are located in the portions of genes called introns, short stretches of DNA that are not used when genetic information is translated to make a protein.

“Very little is known about the regulation of microRNAs located within introns, and especially about their possible interactions with their host genes,” says first author Dr. Ann-Kathrin Eisfeld, a post-doctoral researcher who works in the laboratory of study co-author Dr. Albert de la Chapelle and Bloomfield.

“This is the first description of interplay of an oncogene and its intronic, and possibly oncogenic, microRNA,” Eisfeld says. “It may be the first of other important intronic microRNAs in leukemia and perhaps other malignancies.”

Funding from the National Cancer Institute, the Coleman Leukemia Research Foundation, the Deutsche Krebshilfe-Dr Mildred Scheel Cancer Foundation, the Pelotonia Fellowship Program and the Conquer Cancer Foundation supported this research.

Abstract:

High BAALC expression levels associate with poor outcome in cytogenetically normal AML (CN-AML) patients. Recently, microRNA miR-3151 was discovered in intron 1 of BAALC. To evaluate the prognostic significance of miR-3151expression levels and to gain insight into the biologic and prognostic interplay between miR-3151 and its host, miR-3151 and BAALC expression were measured in pretreatment blood of 179 CN-AML patients. Gene- (GEP) and microRNA-expression (MEP) profiling was performed using microarrays. HighmiR-3151 expression associated with shorter disease-free and overall survival, while high BAALC expression predicted failure of complete remission and shorter overall survival. Patients exhibiting high expression of both miR-3151and BAALC had worse outcome than patients expressing low levels of either gene or both genes. In GEP high miR-3151 expressers showed downregulation of genes involved in transcriptional regulation, post-translational modification and cancer pathways. Two genes, FBXL20 and USP40, were validated as directmiR-3151 targets. In conclusion, high expression of miR-3151 is an independent prognosticator for poor outcome in CN-AML and impacts on different outcome endpoints than its host gene BAALC. The combination of both markers identified a patient subset with the poorest outcome. The described interplay of an intronic miR and its host may have important biologic implications.

http://bloodjournal.hematologylibrary.org/content/early/2012/04/23/blood-2012-02-408492

http://www.sciencedaily.com/releases/2012/05/120514134307.htm

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Reporter: Prabodh Kandala, PhD

Data from the first large U.S. study assessing the effectiveness of long-term “maintenance” therapy with lenalidomide for patients with multiple myeloma show that the drug significantly improves the time to progression and overall survival for patients with this often-deadly hematologic cancer. In a paper published May 10 in the New England Journal of Medicine, Roswell Park Cancer Institute (RPCI) Professor of Oncology Philip L. McCarthy, MD, and co-authors report that lenalidomide (Revlimid), following induction therapy and hematopoietic stem-cell transplant, reduced patients’ risk of disease progression to 20%, compared to 44% disease progression in the placebo arm.

Dr. McCarthy, who is also Director of RPCI’s Blood & Marrow Transplant Program, was the Principal Investigator of the study, Cancer and Leukemia Group B (CALGB) 100104, a phase III randomized, double-blind, placebo-controlled clinical trial that opened in April 2005 and enrolled patients from 47 U.S. transplant centers.

Among 460 patients aged 18 to 70 (median age 59), 321 were randomly assigned to the lenalidomide arm, and 229 to the placebo group. All participants had received prior autologous hematopoietic stem-cell transplantation and had stable (non-progressing) disease. The participants’ assignments and responses to date were unblinded in December 2009 when the primary endpoint of the study (time to disease progression) showed a statistically significant difference between the two study groups. After January 2010, 86 of 128 eligible patients crossed over from the placebo arm to the active arm.

The researchers found that the therapy extended the time to disease progression by 19 months overall, even with the majority of placebo patients without progression crossing over to lenalidomide. The treatment was fairly well-tolerated — particularly as compared to other treatments for multiple myeloma, such as thalidomide. There was more hematologic toxicity, particularly neutropenia, in the lenalidomide group. When the study data was analyzed again in October 2011, at a median follow-up of 34 months, 37% of participants receiving lenalidomide had disease progression or had died, compared to 58% of those in the placebo group.

“These findings fill a gap that existed previously in terms of data on whether maintenance therapy with lenalidomide prolongs the time to disease progression after initial therapy. We now have evidence that it does, in this and the two other lenalidomide studies that are presented in this issue of the Journal,” said Dr. McCarthy. “This shows that patients with multiple myeloma now have options for prolonging the response to initial therapy. The next steps will be trying to improve on these responses by adding new agents that may prove even more effective in combination with lenalidomide following transplant.”

A benefit in overall survival was also seen in this study. At a median follow-up of 34 months, a total of 15% of patients who received lenalidomide and 23% of the patients receiving placebo had died. “The median overall survival among patients who required therapy before 1996 was approximately 3 years. In the era of new agents and autologous hematopoietic stem-cell transplantation, the median overall survival after transplantation is close to 8 years,” Dr. McCarthy and colleagues write in the paper, “Lenalidomide after Stem-Cell Transplantation for Multiple Myeloma.”

There was an increase in second primary cancers among the lenalidomide-arm patients. When looking at both study groups, the cumulative incidence of a second primary cancer was higher among patients in the lenalidomide group than among patients in the placebo group, and the cumulative incidence of progressive disease and death were higher among patients in the placebo group than among patients in the lenalidomide group.

The team’s research was funded by a grant (NCT00114101/CCSG No. 016056) from the National Cancer Institute (NCI) and conducted by the Alliance for Clinical Trials in Oncology (formerly Cancer and Leukemia Group B, or CALGB).

“The results of CALGB 100104 ultimately show that the long-term administration of lenalidomide is feasible,” said Monica M. Bertagnolli, MD, Chief of the Division of Surgical Oncology at Brigham and Women’s Hospital, Professor of Surgery at Harvard Medical School, and Group Chair of the Alliance for Clinical Trials in Oncology. “This positive outcome brings us closer to providing better treatment for patients with multiple myeloma. Additionally, this trial demonstrates the benefits of cooperative group research where patients participating in clinical trials help lead the way to important discoveries.”

http://www.sciencedaily.com/releases/2012/05/120509175807.htm

 

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