Sigmoidoscopy reduces colon cancer risk for men, but not women
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1. Sigmoidoscopy reduces colon cancer risk for men, but not women
Abstract: http://annals.org/aim/article/doi/10.7326/M17-1441
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http://annals.org/aim/article/doi/10.7326/M17-1441

Offering sigmoidoscopy screening to men and women in Norway reduced colorectal cancer (CRC) incidence and mortality in men, but had little or no effect in women. These findings suggest that current guidelines recommending that women get screened for CRC with flexible sigmoidoscopy should be reconsidered. Results of a randomized trial are published in Annals of Internal Medicine.

Sigmoidoscopy screening for CRC has been introduced in the United Kingdom and other countries, including a screening pilot in Norway. Previous analyses of four randomized trials have indicated that sigmoidoscopy screening reduces CRC incidence by 18 percent to 26 percent and CRC mortality by 22 percent to 31 percent after 10 to 17 years of follow-up. However, the effectiveness of sigmoidoscopy screening in women is still uncertain.

Researchers from the Norwegian Cancer Registry and the University of Oslo randomly assigned 98,678 persons aged 50 to 64 to either be screened for CRC with flexible sigmoidoscopy or to have no screening at all. At 17 years, men in the sigmoidoscopy group saw their CRC risk reduced by 34 percent and CRC mortality reduced by 37 percent. The researchers found

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