This is startling news:
I am feeling more mortal now.
Instead of preventing 90 percent of cancers, as some doctors have told patients, colonoscopies might actually prevent more like 60 percent to 70 percent.
“This is a really dramatic result,” said Dr. David F. Ransohoff, a gasteroenterologist at the University of North Carolina. “It makes you step back and worry, ‘What do we really know?’ ”
Dr. Ransohoff and other screening experts say patients should continue to have the test, because it is still highly effective. But they also recommend that patients seek the best colonoscopists by, for example, asking pointed questions about how many polyps they find and remove. They also say patients should be scrupulous in the unpleasant bowel cleansing that precedes the test, and promptly report symptoms like bleeding even if they occur soon after a colonoscopy.