Elena Altemus is 89 and has dementia. She often forgets her children’s names, and sometimes can’t recall whether she lives in Maryland or Italy.

Yet Elena, who entered a nursing home in November, was screened for breast cancer as recently as this summer. "If the screening is not too invasive, why not?" asked her daughter, Dorothy Altemus. "I want her to have the best quality of life possible."

But a growing chorus of geriatricians, cancer specialists and health system analysts are coming forth with a host of reasons: Such testing in the nation's oldest patients is highly unlikely to detect lethal disease, hugely expensive and more likely to harm than help since any follow-up testing and treatment is often invasive.

And yet such screening — some have labeled it "overdiagnosis" — is epidemic in the United States, the result of medical culture, aggressive awareness campaigns and financial incentives to doctors.

By looking for cancers in people who are unlikely to benefit, "we find something that wasn't going to hurt the patient, and then we hurt the patient," said Dr. Sei Lee, an associate professor of geriatrics at the University of California-San Francisco.

Nearly 1 in 5 women with severe cognitive impairment — including older patients like Elena Altemus — are still getting regular mammograms, according to the American Journal of Public Health — even though they’re not recommended for people with a limited life expectancy. And 55 percent of older men with a high risk of death over the next decade still get PSA tests for prostate cancer, according to a 2014 study in JAMA Internal Medicine.

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