Colorectal cancer has received increasing attention in China. It is now one of the leading causes of mortality in both men and women. However, if detected early, there is a high hope for cure. If detected early, more than 95% of patients can be completely cured. In fact, the most amazing thing is that if precancerous polyps can be removed, the tumor will not occur. Precancerous polyps are usually present for many years before they become cancerous. Removal of such polyps may prevent cancer and thus reduce cancer deaths. Therefore, if detected early, colorectal cancer is one of the most curable tumors. Zhang Wei, Department of Anorectal Surgery, Shanghai Changhai Hospital