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Colon cancer testing may be leveling off in US

ATLANTA — After years of steady increases, testing for colon cancer may be leveling off, a federal report suggests.

A large survey done last year found that about two-thirds of Americans ages 50 to 75 have had the recommended screenings for colorectal cancer. That is the same percentage from 2010, apparently marking the first year in at least a decade there was no increase.

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It is not clear why rates may be slowing, said Dr. Marcus Plescia of the Centers for Disease Control and Prevention. The CDC report was released Tuesday.

‘‘Even the hint of a leveling off is very concerning,’’ he said.

Screening rates in the United States had been rising steadily, up from 54 percent in 2002. The jump was attributed partly to the ‘‘Katie Couric effect,’’ named for the former ‘‘Today’’ show host who lost her husband to colon cancer and then had a colonoscopy on television.

The test is the most common of the three screening options for people 50 and older. It is recommended once every 10 years. Doctors use a long flexible tube to remove polyps before they turn cancerous.

Colonoscopy has been credited with making an impact: Colorectal cancer death rates have been dropping for more than 20 years. But the test can be uncomfortable, expensive, and require taking a day off from work.

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