Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Study suggests another look at testosterone-prostate cancer link

20.04.2011
The long-standing prohibition against testosterone therapy in men with untreated or low-risk prostate cancer merits reevaluation, according to a new study published in The Journal of Urology.

"For many decades it had been believed that a history of prostate cancer, even if treated and cured, was an absolute contraindication to testosterone therapy, due to the belief that testosterone activated prostate cancer growth, and could potentially cause dormant cancer cells to grow rapidly," says Abraham Morgentaler, MD of Men's Health Boston. "Generations of medical students and residents were taught that providing testosterone to a man with prostate cancer was like pouring gasoline on a fire."

This study, involving 13 symptomatic testosterone deficient men who also had untreated prostate cancer, suggests this traditional view is incorrect, and that testosterone treatment in men does not cause rapid growth of prostate cancer. It is the first to directly and rigorously assess changes in the prostate among men with prostate cancer who received testosterone therapy.

The men received testosterone therapy while undergoing active surveillance for prostate cancer for a median of 2.5 years. Median age was 58.8 years. The initial biopsy Gleason score was 6/10 for 12 of the men, 7/10 for the other (Gleason score grades the aggressiveness of prostate cancer by its microscopic appearance on a scale of 2-10. Gleason 6 is generally considered low to moderately aggressive, and Gleason 7 moderately aggressive).

Mean testosterone concentration increased from 238 to 664 ng/dl with treatment, yet neither prostate specific antigen (PSA) concentrations nor prostate volume showed any change. Follow-up biopsies of the prostate were performed in all men at approximately yearly intervals, and none developed cancer progression. In fact, 54 percent of the follow-up biopsies revealed no cancer at all.

Although the number of men in the study was small, and none had aggressive or advanced prostate cancer, Morgentaler observed, "These men were rigorously followed. The cancers in these men were typical of the prostate cancers for which men have undergone invasive treatment with surgery or radiation for 25 years. Clearly, the traditional belief that higher testosterone necessarily leads to rapid prostate cancer growth is incorrect."

In a Journal of Urology editorial comment, Martin M. Miner, MD, of the Miriam Hospital and Warren Alpert School of Medicine of Brown University notes the conclusions represent "a remarkable shift in thinking from only five years ago. … If testosterone therapy was not associated with disease progression in men with untreated prostate cancer, how concerned must we be about testosterone therapy in men with treated prostate cancer?"

"An increasing number of newly diagnosed men with prostate cancer opting for active surveillance, and with many of them also desiring treatment for their signs and symptoms of testosterone deficiency, the results suggest a reevaluation of the long standing prohibition against offering testosterone therapy to men with prostate cancer," says Morgentaler.

Refraining from testosterone therapy due to unmerited prostate cancer fears may have adverse lifestyle and health consequences, since testosterone therapy in testosterone deficient men has been shown to improve symptoms of fatigue, decreased libido, and erectile dysfunction. Testosterone therapy may also improve mood, blood sugar control, increase muscle, decrease fat, and improve bone density. Four recent studies have shown that men with high testosterone levels appear to live longer than men with low levels, although it has not yet been shown that treating men with testosterone increases longevity.

Morgentaler commented on an Italian study that showed that low levels of testosterone were associated with aggressive prostate cancer. The risk of aggressive cancer was reduced for men with normal testosterone compared with men with low testosterone.

In an editorial in the journal Cancer, "Turning Conventional Wisdom Upside Down: Low Serum Testosterone and High-Risk Prostate Cancer Morgentaler wrote, "After seven decades of circumstantial evidence pointing us in the wrong direction, perhaps it is time to consider the once unthinkable – conducting a testosterone therapy trial of sufficient size and duration to determine whether normalization of serum testosterone in older men many reduce the risk of prostate cancer, particularly high-risk prostate cancer."

In addition to Morgentaler, a member of the Division of Urology in the BIDMC Department of Surgery and an associate clinic professor of surgery at Harvard Medical School, the study was co-authored by Michael Sweeney, MD of Harvard Medical School and Larry I. Lipshultz, MD, Richard Bennett, MD, Desiderio Avila, Jr., MD, and Mohit Khera, MD, of Baylor Medical College.

The authors reported financial interests and/or other relationships with Auxilium Pharmaceuticals, Watson Pharmaceuticals, Slate Pharmaceuticals, Bayer Healthcare, GlaxoSmithKline, Solvay Pharmaceuticals, Pfizer Inc., Eli Lilly & Co., Allergan, Inc., American Medical Systems and Repros Therapeutics.

Beth Israel Deaconess Medical Center is a patient care, teaching and research affiliate of Harvard Medical School, and currently ranks third in National Institutes of Health funding among independent hospitals nationwide. BIDMC is clinically affiliated with the Joslin Diabetes Center and is a research partner of Dana-Farber/Harvard Cancer Center. BIDMC is the official hospital of the Boston Red Sox.

Jerry Berger | EurekAlert!
Further information:
http://www.bidmc.org

More articles from Health and Medicine:

nachricht Biofilm discovery suggests new way to prevent dangerous infections
23.05.2017 | University of Texas at Austin

nachricht Another reason to exercise: Burning bone fat -- a key to better bone health
19.05.2017 | University of North Carolina Health Care

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>