29 Aug 2013

Could heavy coffee drinking help men battle prostate cancer?

Men with a history of prostate cancer who drank four or more cups of coffee daily had a 59 percent lower risk of seeing their cancer worsen or return, a new study found.

However, the research did not prove that coffee drinking protected against prostate cancer, and there’s no proof that coffee lovers had lower odds of dying from the disease.

The research, conducted by a team at the Fred Hutchinson Cancer Research Center in Seattle, found no effect from tea drinking on prostate cancer. But that might be due to the study’s own limitations, the researchers added.

“Few patients in our [study] cohort were regular tea drinkers, and the highest category of tea consumption was one or more cups per day,” the authors wrote in the Aug. 26 online edition of Cancer Causes & Control. Therefore, any link between tea drinking and prostate cancer outcomes “should be investigated in future studies that have access to larger populations with higher levels of tea consumption,” they added.

The study involved more than 1,000 prostate cancer survivors who ranged in age from 35 to 74 when they were first diagnosed between 2002 and 2005. All had been surveyed on their food and drink habits two years prior to their diagnosis.

The research team then tracked patient outcomes for at least five years after their diagnosis, looking for signs of cancer progression and/or tumor recurrence.

A total of 630 of the men answered questions regarding their ongoing coffee intake, with 61 per cent saying they drank at least  one cup per day, while 12 percent drank four or more cups daily.

Over a median of eight years of follow-up, 38 men died from prostate cancer. Because there were relatively few deaths, it was difficult to reliably say whether or not coffee drinking affected the risk of dying from the disease, the study authors said.

One prostate cancer expert said the findings need to be interpreted with caution.

“This is an interesting study that provides additional evidence for an association between coffee consumption and prostate cancer behavior,” said Dr. Matthew Galsky, an associate professor of medicine at the Icahn School of Medicine at Mount Sinai, in New York City.

“However, it is important to recognize that establishing an association does not confirm causality — that is, that the coffee consumption was the factor that was responsible for the less aggressive prostate cancer behavior.”

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