Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Obesity in prostate cancer patients predicts cancer recurrence and progression

28.06.2006
Obesity in a patient is an independent predictor of whether localized prostate cancer will progress following radiotherapy treatment, say researchers at M. D. Anderson Cancer Center.

In a study reported in the Aug. 1 issue of the journal Cancer, researchers found that moderately and severely obese patients had a 99 percent greater risk of developing biochemical failure (an early marker of cancer progression) than other patients. The study also reports that obese patients had a 66 percent increased risk of having a tumor that recurs or becomes metastatic than did non-obese patients.

This finding mirrors results from a parallel study by M. D. Anderson researchers, reported last year in Clinical Cancer Research, that found that a history of weight gain or obesity at the time of diagnosis also played a role in how aggressive prostate cancer may become after surgery.

"Together, these studies confirm that a man's body mass index (BMI = weight/height2) can be a significant factor in how well he fares after standard treatments for prostate cancer," says the lead researcher of both studies, Sara Strom, Ph.D., an associate professor in the Department of Epidemiology.

"The fact that the same association was found among patients with different risk profiles, and who were treated with different therapies, would suggest that poorer outcomes in obese men are not related to differences in treatment as much as to differences in tumor behavior between obese and non-obese men," she says.

Strom adds that these findings suggest that obese prostate cancer patients should be followed more closely after treatment. "When patients and their physicians are uncertain about the need for further therapy, our research indicates that a man's weight should be factored into that decision," she says.

According to Strom, the study is the first to examine the relationship between obesity and prostate cancer progression after primary therapy with external beam radiotherapy, a common treatment option. The researchers sought to determine whether obesity is an independent predictor of biochemical failure - a rising prostate specific antigen (PSA) level that can indicate advancing cancer - and they also wanted to know if the cancer actually progressed among those patients.

To conduct the study, the scientists examined the records of 873 patients whose prostate cancer was locally confined, and who were treated with radiotherapy at M. D. Anderson between 1988 and 2001. Of these patients, 18 percent were mildly obese and 5 percent were moderately to severely obese.

They found that patients who were obese tended to be diagnosed with prostate cancer at an earlier age than patients who were not obese, and also that African-American men had the highest obesity rates.

After an average follow-up period of 96 months, 295 patients experienced biochemical failure, and cancer recurred in 127 of these patients.

After adjusting for clinical and treatment variables among patients, the researchers found that BMI significantly predicted whether a patient would experience both rising PSA and a return of prostate cancer. For example, biochemical failure occured more quickly with increased BMI: an average of 30 months for patients with normal weight, and 26 months for patients deemed moderately to severely obese. Researchers also found that when comparing obese patients with non-obese patients, obese men had a significantly higher rate of cancer recurrence.

Strom and her colleagues cannot yet say why excess BMI contributed to cancer progression, or whether losing weight after a prostate cancer diagnosis will make any difference in outcome. "But by knowing this association, we may be able to design rational preventive strategies," she says.

Stephanie Dedeaux | EurekAlert!
Further information:
http://www.mdanderson.org

More articles from Health and Medicine:

nachricht Study suggests possible new target for treating and preventing Alzheimer's
02.12.2016 | Oregon Health & Science University

nachricht The first analysis of Ewing's sarcoma methyloma opens doors to new treatments
01.12.2016 | IDIBELL-Bellvitge Biomedical Research Institute

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: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>