by TARA PARKER-POPE
Screening for early detection of cancer sounds like a no-brainer, but it’s not an easy choice for men considering regular P.S.A. tests, which measure blood levels of prostate-specific antigen and are used to detect prostate cancer. Though use of the test is widespread, studies show that the screening saves few, if any, lives.
While the test helps find cellular changes in the prostate that meet the technical definition of cancer, they often are so slow-growing that if left alone they will never cause harm. But once cancer is detected, many men, frightened by the diagnosis, opt for aggressive surgical and radiation treatments that do far more damage than their cancers would have, leaving many impotent and incontinent.
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