1997年2月2日《美国医学论坛报》报道，大肠癌筛查能有效地降低恶性肿瘤的死亡率。美国一个专家委员会指出，所有年过50岁的无症状和无患大肠癌危险因素的人均应接受大肠癌筛查。筛查准则指出，有患大肠癌危险因素的人应更早接受筛查。该专家委员会副主席Fletcher医师说，死于 On February 2, 1997, the American Medical Tribune reported that screening for colorectal cancer can effectively reduce the mortality of malignant tumors. An expert committee in the United States pointed out that all people who are over the age of 50 asymptomatic and do not have colorectal cancer risk factors should undergo colorectal cancer screening. Screening guidelines point out that people with risk factors for colorectal cancer should be screened earlier. Dr. Fletcher, vice chairman of the expert committee, said that he died of