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Elizabeth Cooney is a health reporter for the Worcester Telegram & Gazette.
Boston Globe Health and Science staff:
Karen Weintraub, Deputy Health and Science Editor, and Gideon Gil, Health and Science Editor.
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Monday, November 12, 2007
Overweight men with prostate cancer have a higher risk of dying
Men who are overweight when they have locally advanced prostate cancer have almost double the risk of dying from the disease compared with men of normal weight, new research says.
The study, led by a team at Massachusetts General Hospital, is the first to find that excess weight alone is associated with deaths in men whose tumors had grown beyond the prostate or spread to lymph nodes, according to the study, which appears in the journal Cancer.
"The prevalence of overweight and obesity continues to increase in United States, so itís an issue that's perhaps more important than ever," author Dr. Matthew R. Smith said in an interview. "What we need to do from here are additional studies to understand the mechanisms by which overweight and obesity are associated with worse prostate cancer mortality."
For men with a normal body mass index of 25, the death rate from prostate cancer was 6.5 percent after eight years. For overweight men, with a BMI between 25 and 30, it was 13.1 percent, and for obese men, with a BMI over 30, the death rate was 12.2 percent.
Obesity is not a new suspect in prostate cancer. Previous work has linked being overweight to having more aggressive forms of the cancer and higher rates of recurrence after radiation and surgery to remove the prostate gland. But other potential reasons for the difference in outcomes, from difficulty examining obese patients to possible biases in screenings, had not been isolated in the observational studies.
The study reported in Cancer analyzed data from a large randomized trial originally conducted to study radiation and hormone therapy in about 900 men with prostate cancer. That means the men had similar disease characteristics to be included in the trial. The authors, who also include researchers from Fox Chase Cancer Center and UCLA, looked at the men's BMI at the start of the trial and what happened to them over about eight years of follow-up.
Dr. Oliver Sartor of Dana-Farber Cancer Institute said the researchers have made an important observation from a well-designed trial.
"Now the hypothesis-driven question to ask is whether or not weight loss after diagnosis with prostate cancer will lead to better outcomes," he said in an interview. "That's an important question."