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Estrogen Helps Drive Distinct, Aggressive Form of Prostate Cancer
May 28, 2008Using a breakthrough technology, researchers led by a Weill Cornell Medical College scientist have pinpointed the hormone estrogen as a key player in about half of all prostate cancers.
Estrogen-linked signaling helps drive a discrete and aggressive form of the disease caused by a chromosomal translocation, which in turn results in the fusion of two genes.
"Fifty percent of prostate cancers harbor a common recurrent gene fusion, and we believe that this confers a more aggressive nature to these tumors," explains study senior author Dr. Mark A. Rubin, professor of pathology and laboratory medicine, and vice chair for experimental pathology at Weill Cornell Medical College. Dr. Rubin is also attending pathologist at NewYork-Presbyterian Hospital/Weill Cornell Medical Center.
"Interfering with this gene fusion - or its downstream molecular pathways - will be crucial in the search for drugs that fight the disease. Based on our new data, we now believe that inhibiting estrogen may be one way of doing so," he says.
The findings are published in the May 27 online edition of the Journal of the National Cancer Institute. Dr. Rubin conducted the study while at the Brigham and Women's Hospital and in collaboration with Dr. Todd Golub and other members of the Broad Institute of MIT and Harvard, in Cambridge, Mass. His team is now continuing this line of research at Weill Cornell.
Dr. Rubin, along with researchers at the University of Michigan, first discovered and described the common fusions between the TMPRSS2 and ETS family member genes subset of prostate cancer in the journal Science in 2005. "The discovery showed that these malignancies occur after an androgen (male hormone)-dependent gene fuses with an oncogene - a type of gene that causes cancer," he explains.
Experts have long understood that male hormones help spur prostate cancer - in fact, androgen-deprivation therapy is a first-line treatment against the disease. And yet the disease can progress despite androgen reduction, suggesting that other pathways might be at work.
"So, we wanted to learn more - what is the genetic and molecular 'fingerprint' of this aggressive subset of prostate tumor?" Dr. Rubin says.
Answering that question required the analysis of 455 prostate cancer samples from trials in Sweden and the United States that were conducted as far back as the mid-1970s.
"These samples were placed in fixative and not frozen, so we needed new methods of retrieving the genetic information," Dr. Rubin says. To do so, his team led by co-lead authors Dr. Sunita Setlur and Dr. Kirsten Mertz developed an innovative technology for effectively "reading" the gene transcription profiles hidden in the samples.
"That led us to perform the largest gene-expression microarray analysis yet conducted in prostate cancer research, amassing information on more than 6,000 genes," Dr. Rubin says. "This allowed us to obtain a robust, 87-gene expression 'signature' that distinguishes fusion-positive TMPRSS2-ERG cancers from other prostate malignancies."
A close analysis of the signature yielded a surprise: that estrogen-dependent molecular pathways appear to play a crucial role in regulating (and encouraging) this aggressive subset of prostate cancer.
While estrogen is typically thought of as a "female" hormone, men produce it as well.
"Now, we show for the first time that this natural estrogen can stimulate the production of the cancer-linked TMPRSS2-ERG transcript, via the estrogen receptor (ER)-alpha and ER-beta. These receptors are found on the surface of some prostate cancer cells," Dr. Rubin explains.
The finding could have implications for prostate cancer research, including drug development. According to Dr. Rubin, "We now believe that agents that dampen estrogen activity (ER-beta antagonists) could inhibit fusion-positive prostate cancers. Alternatively, any intervention that boosts estrogen activity (ER-alpha) might also give a boost to these aggressive malignancies."
Research into just why fusion-positive prostate cancers are so aggressive - and potential molecular drug targets to help curb that aggression - will continue under Dr. Rubin's direction at Weill Cornell, in collaboration with members of his group and with computational biologist Dr. Francesca Demichelis.
"The technological achievement of using fixed samples that were up to 30 years old is significant," Dr. Rubin says. "In the future, we hope to explore banked tissues from clinical trials to help understand why they failed. This should lead to insight for designing the next trial."
This work was funded by the U.S. National Institutes of Health, a Prostate SPORE grant at the Dana-Farber/Harvard Cancer Center, Swiss Foundation for Medical-Biological Grants SSMBS, U.S. Department of Defense and the Prostate Cancer Foundation.
Co-researchers include study co-lead authors Dr. Sunita Setlur and Dr. Kirsten Mertz of Brigham and Women's Hospital and Harvard Medical School, Boston; Dr. Yujin Hoshida and Dr. Todd Golub of the Broad Institute and the Dana-Farber Cancer Institute, Boston; Dr. Francesca Demichelis of Weill Cornell Medical College and Harvard Medical School, Boston; Dr. Mathieu Lupien of the Dana-Farber Cancer Institute; Dr. Sven Perner and Jeff Tang of Weill Cornell Medical College; Andrea Sboner of Yale University, New Haven; Dr. Yudi Pawitan and Dr. Katja Fall of the Karolinska Institutet, Stockholm, Sweden; Dr. Ove Andren, Dr. Jan-Erik Johansson and Dr. Swen-Olof Andersson, of Orebro University Hospital, Orebro, Sweden; Laura A. Johnson of Brigham and Women's Hospital, Boston; Dr. Hans-Olov Adami, of Karolinska Institutet, Sweden, and Harvard School of Public Health, Boston; Dr. Stefano Calza, of the Karolinska Institutet, Sweden, and the University of Brescia, Italy; Dr. Arul M. Chinnaiyan, Dr. Daniel Rhodes and Scott Tomlins, of the University of Michigan Medical School, Ann Arbor; Dr. Lorelei Mucci and Dr. Meir Stampfer of Harvard Medical School, Harvard School of Public Health and Brigham and Women's Hospital, Boston; Dr. Philip Kantoff of Dana-Farber Cancer Institute and Harvard Medical School; Dr. Eberhard Varenhorst, of University Hospital Linkoping, Sweden; and Dr. Myles Brown of the Dana-Farber Cancer Institute.
Dr. Mark A. Rubin, Dr. Francesca Demichelis, Dr. Sven Perner, Dr. Arul M. Chinnaiyan and Scott Tomlins are co-inventors on a patent filed by the University of Michigan and the Brigham and Women's Hospital, covering the diagnostic and therapeutic fields for ETS fusions in prostate cancer.
Weill Cornell Medical College
Weill Cornell Medical College, Cornell University's medical school located in New York City, is committed to excellence in research, teaching, patient care and the advancement of the art and science of medicine, locally, nationally and globally. Weill Cornell, which is a principal academic affiliate of NewYork-Presbyterian Hospital, offers an innovative curriculum that integrates the teaching of basic and clinical sciences, problem-based learning, office-based preceptorships, and primary care and doctoring courses. Physicians and scientists of Weill Cornell Medical College are engaged in cutting-edge research in areas such as stem cells, genetics and gene therapy, geriatrics, neuroscience, structural biology, cardiovascular medicine, transplantation medicine, infectious disease, obesity, cancer, psychiatry and public health - and continue to delve ever deeper into the molecular basis of disease in an effort to unlock the mysteries of the human body in health and sickness. In its commitment to global health and education, the Medical College has a strong presence in places such as Qatar, Tanzania, Haiti, Brazil, Austria and Turkey. Through the historic Weill Cornell Medical College in Qatar, the Medical College is the first in the U.S. to offer its M.D. degree overseas. Weill Cornell is the birthplace of many medical advances - including the development of the Pap test for cervical cancer, the synthesis of penicillin, the first successful embryo-biopsy pregnancy and birth in the U.S., the first clinical trial of gene therapy for Parkinson's disease, the first indication of bone marrow's critical role in tumor growth, and most recently, the world's first successful use of deep brain stimulation to treat a minimally-conscious brain-injured patient. For more information, visit www.med.cornell.edu.
Weill Cornell Medical College
"Interfering with this gene fusion - or its downstream molecular pathways - will be crucial in the search for drugs that fight the disease. Based on our new data, we now believe that inhibiting estrogen may be one way of doing so," he says.
The findings are published in the May 27 online edition of the Journal of the National Cancer Institute. Dr. Rubin conducted the study while at the Brigham and Women's Hospital and in collaboration with Dr. Todd Golub and other members of the Broad Institute of MIT and Harvard, in Cambridge, Mass. His team is now continuing this line of research at Weill Cornell.
Dr. Rubin, along with researchers at the University of Michigan, first discovered and described the common fusions between the TMPRSS2 and ETS family member genes subset of prostate cancer in the journal Science in 2005. "The discovery showed that these malignancies occur after an androgen (male hormone)-dependent gene fuses with an oncogene - a type of gene that causes cancer," he explains.
Experts have long understood that male hormones help spur prostate cancer - in fact, androgen-deprivation therapy is a first-line treatment against the disease. And yet the disease can progress despite androgen reduction, suggesting that other pathways might be at work.
"So, we wanted to learn more - what is the genetic and molecular 'fingerprint' of this aggressive subset of prostate tumor?" Dr. Rubin says.
Answering that question required the analysis of 455 prostate cancer samples from trials in Sweden and the United States that were conducted as far back as the mid-1970s.
"These samples were placed in fixative and not frozen, so we needed new methods of retrieving the genetic information," Dr. Rubin says. To do so, his team led by co-lead authors Dr. Sunita Setlur and Dr. Kirsten Mertz developed an innovative technology for effectively "reading" the gene transcription profiles hidden in the samples.
"That led us to perform the largest gene-expression microarray analysis yet conducted in prostate cancer research, amassing information on more than 6,000 genes," Dr. Rubin says. "This allowed us to obtain a robust, 87-gene expression 'signature' that distinguishes fusion-positive TMPRSS2-ERG cancers from other prostate malignancies."
A close analysis of the signature yielded a surprise: that estrogen-dependent molecular pathways appear to play a crucial role in regulating (and encouraging) this aggressive subset of prostate cancer.
While estrogen is typically thought of as a "female" hormone, men produce it as well.
"Now, we show for the first time that this natural estrogen can stimulate the production of the cancer-linked TMPRSS2-ERG transcript, via the estrogen receptor (ER)-alpha and ER-beta. These receptors are found on the surface of some prostate cancer cells," Dr. Rubin explains.
The finding could have implications for prostate cancer research, including drug development. According to Dr. Rubin, "We now believe that agents that dampen estrogen activity (ER-beta antagonists) could inhibit fusion-positive prostate cancers. Alternatively, any intervention that boosts estrogen activity (ER-alpha) might also give a boost to these aggressive malignancies."
Research into just why fusion-positive prostate cancers are so aggressive - and potential molecular drug targets to help curb that aggression - will continue under Dr. Rubin's direction at Weill Cornell, in collaboration with members of his group and with computational biologist Dr. Francesca Demichelis.
"The technological achievement of using fixed samples that were up to 30 years old is significant," Dr. Rubin says. "In the future, we hope to explore banked tissues from clinical trials to help understand why they failed. This should lead to insight for designing the next trial."
This work was funded by the U.S. National Institutes of Health, a Prostate SPORE grant at the Dana-Farber/Harvard Cancer Center, Swiss Foundation for Medical-Biological Grants SSMBS, U.S. Department of Defense and the Prostate Cancer Foundation.
Co-researchers include study co-lead authors Dr. Sunita Setlur and Dr. Kirsten Mertz of Brigham and Women's Hospital and Harvard Medical School, Boston; Dr. Yujin Hoshida and Dr. Todd Golub of the Broad Institute and the Dana-Farber Cancer Institute, Boston; Dr. Francesca Demichelis of Weill Cornell Medical College and Harvard Medical School, Boston; Dr. Mathieu Lupien of the Dana-Farber Cancer Institute; Dr. Sven Perner and Jeff Tang of Weill Cornell Medical College; Andrea Sboner of Yale University, New Haven; Dr. Yudi Pawitan and Dr. Katja Fall of the Karolinska Institutet, Stockholm, Sweden; Dr. Ove Andren, Dr. Jan-Erik Johansson and Dr. Swen-Olof Andersson, of Orebro University Hospital, Orebro, Sweden; Laura A. Johnson of Brigham and Women's Hospital, Boston; Dr. Hans-Olov Adami, of Karolinska Institutet, Sweden, and Harvard School of Public Health, Boston; Dr. Stefano Calza, of the Karolinska Institutet, Sweden, and the University of Brescia, Italy; Dr. Arul M. Chinnaiyan, Dr. Daniel Rhodes and Scott Tomlins, of the University of Michigan Medical School, Ann Arbor; Dr. Lorelei Mucci and Dr. Meir Stampfer of Harvard Medical School, Harvard School of Public Health and Brigham and Women's Hospital, Boston; Dr. Philip Kantoff of Dana-Farber Cancer Institute and Harvard Medical School; Dr. Eberhard Varenhorst, of University Hospital Linkoping, Sweden; and Dr. Myles Brown of the Dana-Farber Cancer Institute.
Dr. Mark A. Rubin, Dr. Francesca Demichelis, Dr. Sven Perner, Dr. Arul M. Chinnaiyan and Scott Tomlins are co-inventors on a patent filed by the University of Michigan and the Brigham and Women's Hospital, covering the diagnostic and therapeutic fields for ETS fusions in prostate cancer.
Weill Cornell Medical College
Weill Cornell Medical College, Cornell University's medical school located in New York City, is committed to excellence in research, teaching, patient care and the advancement of the art and science of medicine, locally, nationally and globally. Weill Cornell, which is a principal academic affiliate of NewYork-Presbyterian Hospital, offers an innovative curriculum that integrates the teaching of basic and clinical sciences, problem-based learning, office-based preceptorships, and primary care and doctoring courses. Physicians and scientists of Weill Cornell Medical College are engaged in cutting-edge research in areas such as stem cells, genetics and gene therapy, geriatrics, neuroscience, structural biology, cardiovascular medicine, transplantation medicine, infectious disease, obesity, cancer, psychiatry and public health - and continue to delve ever deeper into the molecular basis of disease in an effort to unlock the mysteries of the human body in health and sickness. In its commitment to global health and education, the Medical College has a strong presence in places such as Qatar, Tanzania, Haiti, Brazil, Austria and Turkey. Through the historic Weill Cornell Medical College in Qatar, the Medical College is the first in the U.S. to offer its M.D. degree overseas. Weill Cornell is the birthplace of many medical advances - including the development of the Pap test for cervical cancer, the synthesis of penicillin, the first successful embryo-biopsy pregnancy and birth in the U.S., the first clinical trial of gene therapy for Parkinson's disease, the first indication of bone marrow's critical role in tumor growth, and most recently, the world's first successful use of deep brain stimulation to treat a minimally-conscious brain-injured patient. For more information, visit www.med.cornell.edu.
Weill Cornell Medical College
Prostate Cancer Current Events and Prostate Cancer News RSSDietary supplements discouraged for prostate cancer patients
Prostate-specific dietary supplements should not be taken during radiation therapy treatments because they have been shown to increase the radiosensitivity of normal prostate cell lines, leading to normal tissue complications, according to a study in the March issue of the International Journal of Radiation Oncology*Biology*Physics, the official journal of the American Society for Radiation Oncology (ASTRO).
Like little golden assassins, 'smart' nanoparticles identify, target and kill cancer cells
Another weapon in the arsenal against cancer: Nanoparticles that identify, target and kill specific cancer cells while leaving healthy cells alone.
UAB Cancer Center, Urologists Affirm Men Should Take Lead in Deciding to Test for Prostate Cancer
Men who undergo prostate-cancer screening should discuss with a doctor the uncertainties, risks and benefits of the test before it is performed, says Edward Partridge, M.D., president-elect of the American Cancer Society (ACS) National Board of Directors and director of the University of Alabama at Birmingham (UAB) Comprehensive Cancer Center.
Freezing breast tumors helps stop cancer's spread in mice, U-M study finds
Freezing a cancer kills it in its place, and also appears to generate an immune response that helps stop the cancer's spread, leading to improved survival rates over surgery.
Prostate cancer surgeons 'feel' with their eyes
Robotic surgical technology with its three-dimensional, high-definition view gives surgeons the sensation of touch, even as they operate from a remote console.
New tool illuminates connections between stem cells and cancer
Researchers have a new tool to understand how cancers grow -- and with it a new opportunity to identify novel cancer drugs. They've been able to break apart human prostate tissue, extract the stem cells in that tissue, and alter those cells genetically so that they spur cancer.
Few differences in outcomes between open and laparoscopic prostate surgery
Of the 200,000 men newly diagnosed with prostate cancer each year in the United States, about one-third will undergo surgical treatment.
Small Liquid Sensor May Detect Cancer Instantly, Could Lead to Home Detection Kit
What if it were possible to go to the store and buy a kit to quickly and accurately diagnose cancer, similar to a pregnancy test? A University of Missouri researcher is developing a tiny sensor, known as an acoustic resonant sensor, that is smaller than a human hair and could test bodily fluids for a variety of diseases, including breast and prostate cancers.
Fluorescent probes light up cancerous tumors
Building on his Nobel Prize-winning work creating fluorescent proteins that light up the inner workings of cells, a team of researchers led by Howard Hughes Medical Institute investigator Roger Tsien, PhD, professor of pharmacology, chemistry and biochemistry at the University of California, San Diego and the Moores UCSD Cancer Center has developed biological probes that can stick to and light up tumors in mice.
Predicting prognosis and treatment response in a subset of pancreatic cancer patients
Specific chemical modifications to proteins called histones, which are found in the nucleus of cells and act as spools around which DNA is wound, can be used to predict prognosis and response to treatment in subsets patients with pancreatic cancer.
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