But increasingly, questions are being raised about the overtesting of older patients, part of a growing skepticism about the widespread practice of routine screening for cancer and other ailments of people in their 70s, 80s and even 90s. Critics say there is little evidence of benefit — and considerable risk — from common tests for colon, breast and prostate cancer, particularly for those with serious problems such as heart disease or dementia that are more likely to kill them.
Too often these tests, some doctors and researchers say, trigger a cascade of expensive, anxiety-producing diagnostic procedures and invasive treatments for slow-growing diseases that may never cause problems, leaving patients worse off than if they had never been tested. In other cases, they say, treatment, rather than extending or improving life, actually reduces its quality in the final months.
“An ounce of prevention can be a ton of trouble,” observed geriatrician Robert Jayes, an associate professor of medicine at George Washington University School of Medicine. “Screening can label someone with a disease they were blissfully unaware of.” Dartmouth physician Lisa M. Schwartz cites one such case: a healthy 78-year-old man who was left incontinent and impotent by radiation treatments for prostate cancer, a disease that typically grows so slowly that many men die with — but not of — it.
The U.S. Preventive Services Task Force, an independent panel of experts that evaluates the risks and benefits of screening tests, does not endorse PSA testing or routine colon screening after age 75. The panel, whose recommendations will guide some coverage decisions under the 2010 federal health law that expands access to screening, says there is no evidence for or against mammography after age 74 and recommends that most women stop getting Pap smears to detect cervical cancer after 65.
So far the task force’s guidelines appear to have had limited impact. Researchers in June reported in the journal Cancer that nearly half of primary-care doctors would advise a woman with terminal lung cancer to get a routine mammogram — even if she was 80 years old. A 2010 JAMA study of more than 87,000 Medicare patients found that a “sizeable proportion” with advanced cancers continued to be screened for other malignancies. Last May, Texas researchers reported in the Archives of Internal Medicine that 46 percent of 24,000 Medicare recipients with a previous normal test underwent a repeat colonoscopy in less than seven years and sometimes as few as three — compared with the 10 years recommended by the task force. In nearly a quarter of cases, the repeat test was performed for no discernible reason. (Medicare is supposed to cover the screening test, which can cost about $2,000, only once a decade if no cancer or polyps have been found, but the program paid for all but 2 percent of the procedures reviewed by the Texas researchers.)
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