在美国,结肠癌是恶性肿瘤的第二大死亡原因。1985年约有60,000例死亡,并新发现138,000例。国际肿瘤协会1977～1982年的统计指出,结肠癌的5年生存率是54％,直肠癌是51％。为了增加结肠直肠癌的生存率,必须集中力量预防和早期发现恶性肿瘤和癌前病变。结肠直肠癌的预防可以分两方面:①认识饮食、 In the United States, colon cancer is the second leading cause of death for malignant tumors. In 1985, there were approximately 60,000 deaths and 138,000 new cases were discovered. According to statistics from the International Tumor Association from 1977 to 1982, the 5-year survival rate of colon cancer is 54% and rectal cancer is 51%. In order to increase the survival rate of colorectal cancer, it is necessary to focus on prevention and early detection of malignant tumors and precancerous lesions. Colorectal cancer prevention can be divided into two aspects: 1 understanding of diet,