结直肠癌是全球常见的恶性肿瘤，发达的国家和地区如西欧和美国，结直肠癌发病率特别高。１９９０年欧共体有１３０万新发现病例，８３７０００例死于癌肿。欧洲男性肿瘤病人中，结直肠肿瘤的发病率仅次于肺癌居第二位，女性病人中结直肠癌仅次于乳癌也居第二位［１］。在... Colorectal cancer is a common malignant tumor worldwide. In developed countries and regions such as Western Europe and the United States, the incidence of colorectal cancer is particularly high. In 1990, 1.3 million new cases were found in the European Community and 837,000 died of cancer. In Europe, the incidence of colorectal cancer is second only to lung cancer among the cancer patients in men. Colorectal cancer is second only to breast cancer in women patients [1]. in...