In patients with more aggressive forms of prostate cancer, the researchers also found an even stronger correlation between obesity and mortality.
This study included 751 Kaiser Permanente patients with prostate cancer who underwent radical prostatectomy, an operation that includes removal of the prostate and surrounding tissue. The researchers explored the association between the patients' body mass index and prostate cancer mortality, adjusted for tumor aggressiveness and other characteristics.
The researchers found men who died from prostate cancer were 50 percent more likely to be overweight or obese at diagnosis compared to men who did not die from the disease. Men with high Gleason scores, a rating of the aggressiveness of prostate cancer cells, had the highest association between BMI and death, specifically men with Gleason scores of 8 or higher. The Gleason score ranges from 2 to 10, with the highest number representing the greatest likelihood of tumor cells spreading.
"We found among patients undergoing surgical treatment for prostate cancer, weight at time of diagnosis is more strongly correlated with prostate cancer survival than many other factors researchers have studied in the past, including some prostate cancer treatments," said lead author Reina Haque, PhD, a researcher at Kaiser Permanente Southern California's Department of Research & Evaluation in Pasadena, Calif. "Moving forward, we are hoping future studies will examine the effect of weight loss and other lifestyle modifications on prostate cancer mortality."
Additional studies are needed to determine which lifestyle modifications, such as diet or exercise, could prolong a prostate cancer patient's life. Further investigation also is needed to determine if the findings of this study, which looked at men who had prostate cancer surgery, apply to men who received other treatments such as radiation or hormone therapy.
Although the connection between men's weight at prostate cancer diagnosis and likelihood of survival has been examined, many previous studies were limited by self-reported body weight data or it was unclear when the BMI data were obtained. So the link between obesity and prostate cancer mortality remains controversial. However, the methodology of this study was different because the researchers used BMI collected from medical records, instead of self-reported data. The researchers identified men who died of prostate cancer and compared their BMI at time of diagnosis to controls to determine if body weight is related prostate cancer death. The biological relationship between obesity and prostate cancer prognosis is still not understood, and is an active area of research.
Kaiser Permanente can conduct transformational health research like this in part because it has the largest private patient-centered electronic health record system in the world. The organization's electronic health record system, Kaiser Permanente HealthConnect®, securely connects 9.1 million patients to 17,000 physicians in 611 medical offices and 38 hospitals. It also connects Kaiser Permanente's research scientists to one of the most extensive collections of longitudinal medical data available, facilitating studies and important medical discoveries that shape the future of health care delivery for patients and the medical community.
Kaiser Permanente is committed to broadening the medical community's understanding of prostate cancer and other common cancers. Earlier this year, Kaiser Permanente researchers found that taking measurements over time of prostate specific antigen (PSA), the most commonly used screening test for prostate cancer in men, improves the accuracy of aggressive prostate cancer detection when compared to a single measurement of PSA.
The U.S. National Institutes of Health/National Cancer Institute Grant R01CA100743 (SW) supported this study.
Other authors of the paper include: Stephen K. Van Den Eeden, PhD, Division of Research, Kaiser Permanente Northern California, Oakland, Calif.; Lauren P. Wallner, PhD, MPH, Research & Evaluation, Kaiser Permanente Southern California, Pasadena, Calif.; Kathryn Richert-Boe, MD, Center for Health Research, Kaiser Permanente Northwest, Portland, Ore.; Bhaskar Kallakury, MD, Georgetown University, Dept. of Pathology, Washington, D.C.; Renyi Wang, PhD, Research & Evaluation, Kaiser Permanente Southern California, Pasadena, Calif.; Sheila Weinmann, PhD, Center for Health Research, Kaiser Permanente Northwest, Portland, Ore.
About the Department of Research & Evaluation
The Department of Research & Evaluation conducts high-quality, innovative research into disease etiology, prevention, treatment and care delivery. Investigators conduct epidemiology, health sciences and behavioral research as well as clinical trials. Areas of interest include diabetes and obesity, cancer, HIV/AIDS, cardiovascular disease, aging and cognition, pregnancy outcomes, women's and children's health, quality and safety, and pharmacoepidemiology. Located in Pasadena, Calif., the department focuses on translating research to practice quickly to benefit the health and lives of Kaiser Permanente Southern California members and the general population. Visit kp.org/research.
About Kaiser Permanente
Kaiser Permanente is committed to helping shape the future of health care. We are recognized as one of America's leading health care providers and not-for-profit health plans. Founded in 1945, our mission is to provide high-quality, affordable health care services and to improve the health of our members and the communities we serve. We currently serve more than 9.1 million members in nine states and the District of Columbia. Care for members and patients is focused on their total health and guided by their personal physicians, specialists and team of caregivers. Our expert and caring medical teams are empowered and supported by industry-leading technology advances and tools for health promotion, disease prevention, state-of-the-art care delivery and world-class chronic disease management. Kaiser Permanente is dedicated to care innovations, clinical research, health education and the support of community health. For more information, go to kp.org/newscenter.
Joshua Weisz | EurekAlert!
Rutgers-led innovation could spur faster, cheaper, nano-based manufacturing
14.02.2018 | Rutgers University
New study from the University of Halle: How climate change alters plant growth
12.01.2018 | Martin-Luther-Universität Halle-Wittenberg
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).
Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
16.02.2018 | Information Technology
16.02.2018 | Health and Medicine
16.02.2018 | Physics and Astronomy