A new study suggests U.S. researchers overestimate a colonoscopy's ability to detect colon cancer.
invited to undergo a colonoscopy actually had the procedure done, the researchers report.
During the five years Bretthauer lived in the U.S., he’d heard the conventional wisdom that those who received colonoscopies cut their colon cancer risk by 80 percent. Yet he and his colleagues have now found that merely offering colonoscopies does not significantly decrease cancer death. When comparing those who opted for the colonoscopy with a control group, colonoscopies reduced cancer death by about half.
Because colon cancer screening with colonoscopies isn’t standard in Poland, Norway or Sweden, Jason Dominitz — a professor at the University of Washington and the national director of gastroenterology for the Veterans Health Administration — wondered whether the quality of their colonoscopies influenced the study’s results.
“It should be at least 25 percent. The average rate in the U.S. is 40 percent,” he says, though adding that, because women tend to have fewer adenomas than men, doctors whose patients are mostly women should have a benchmark ADR of at least 20 percent.The Nordic trial was a randomized trial, while U.S. studies are cohort studies in which all study participants receive colonoscopies. With cohort studies, the “healthy volunteer effect” can influence results, Dominitz says.
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