大肠癌是西方国家最常见的恶性肿瘤,位居世界恶性肿瘤死亡病因第3位。我国大肠癌发病率和病死率呈逐年上升趋势。近年来尽管手术方式方法不断改进,但接受根治性手术的患者中仍有40%～50%死于术后肿瘤复发与转移,即使常规病理检查未发现淋巴结转移的Dukes A和Dukes B期患者中仍 Colorectal cancer is the most common malignant tumor in western countries, ranking the third in the world in the cause of death from malignant tumors. The incidence of colorectal cancer and mortality in China showed an upward trend year by year. In recent years, although the surgical methods and methods continue to improve, but still undergoing radical surgery in patients with 40% to 50% of patients died of tumor recurrence and metastasis, even if the routine pathological examination did not find lymph node metastasis Dukes A and Dukes B patients still