结直肠癌是常见的恶性肿瘤之一,发病部位依次为直肠、乙状结肠、盲肠、升结肠、降结肠、横结肠。随着年龄增长,发病率有所增高。近年来,结直肠癌的预防、诊断和治疗有了一定的进展,但其早期诊断率仍无明显提高,明确诊断者约80%为进展期结直肠癌,进展期结直肠癌的治疗,目前仍以 Colorectal cancer is one of the common malignant tumors, the incidence of sites followed by rectum, sigmoid colon, cecum, ascending colon, descending colon, transverse colon. With age, the incidence has increased. In recent years, there has been some progress in the prevention, diagnosis and treatment of colorectal cancer, but its early diagnosis rate is still not significantly improved. About 80% of the diagnosed patients are the patients with advanced colorectal cancer and advanced colorectal cancer. At present, Still