大肠癌包括结肠癌和直肠癌,是常见恶性肿瘤之一。大肠癌发病部位依次为直肠、乙状结肠、盲肠、降结肠、横结肠。随着年龄的增长发病率有所增高。由于人类寿命的延长,老龄患者愈来愈多,大肠癌的发病率及死亡率在我国乃至世界有逐渐上升的趋势。 Colorectal cancer, including colon and rectal cancer, is one of the common malignant tumors. Colorectal cancer incidence sites followed by rectum, sigmoid colon, cecum, descending colon, transverse colon. With age, the incidence has increased. Due to the extension of human life expectancy, more and more elderly patients, the incidence of colorectal cancer and mortality in China and the world there is a gradual upward trend.