Although the colonoscopy is considered the most effectie means to detect precursors of colon cancer, the oerall reported rate of missing colorectal tumors is 24 percent, as reported in 1997.

• 虽然结肠镜检查是检测结肠癌前驱病变的最有效的方法，但1997年报告的总体结直肠肿瘤的漏检率仍达24%25。