结直肠癌是美国第二大癌症死因,大多数结直肠癌开始于良性病变即结肠腺瘤样息肉。结直肠癌筛查以切除息肉为有效手段,可降低结直肠癌发病率和死亡率。因此,目前指南中推荐,50岁以上人群(或结直肠癌高风险人群)应常规筛查结直肠癌,可惜的是,在美国筛查人群少于半数。目前国家开始实行适宜的筛查试验。每一个筛 Colorectal cancer is the second leading cause of cancer in the United States, and most colorectal cancers begin with a benign lesion, colonic adenomatous polyps. Colorectal cancer screening for the removal of polyps as an effective means can reduce the incidence of colorectal cancer and mortality. Therefore, the current guidelines recommend that people over the age of 50 (or people at high risk for colorectal cancer) should routinely screen for colorectal cancer. Unfortunately, less than half of the population is screened in the United States. At present, the country has begun to implement appropriate screening tests. Each sieve