University Of Chicago Medical Center

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FILE - In this Sept. 13, 2011 photo provided by the University of Chicago Medical Center, a doctor watches an internal video of the patient’s body as he assists in prostate cancer surgery at the University of Chicago Medical Center in Chicago. Surgery to remove the prostate saves lives compared to "watchful waiting" for some men whose cancers were found because they were causing symptoms, long-term results from a Scandinavian study suggest. However, U.S. men should not assume that immediate treatment is best, doctors warn, because the study was done before PSA testing became common, and a newer study found the opposite. Results were published in the Thursday, March 6, 2014 issue of the New England Journal of Medicine. (AP Photo/University of Chicago Medical Center, Bruce Powell)