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大肠癌是严重威胁人类生命健康的常见恶性肿瘤之一.国内统计在恶性肿瘤的死因中排列第五.减少发病率,改善预后,成为当前大肠癌防治研究的主要策略.业已表明,大肠癌的预后与早期诊断密切相关,例如,早期确诊的大肠癌其术后五年生存率可达80%以上,而中晚期大肠癌不足40%.为此,通过提高大肠癌早期诊断率以改善大肠癌预后已成为大肠癌防治切实可行的措施.然而根据临床征象如疼痛、便血、体重减轻或肠道功能紊乱等作为大肠癌早期诊断线索并未获得满意的结果,因为大肠癌症状出现的早晚与大肠癌的进展及预后亦无必然联系.无症状人群普查是提高大肠癌早期诊断率的
Colorectal cancer is one of the most common malignant tumors that seriously threaten human life and health. Domestic statistics rank the fifth among the causes of malignant tumors. Decreasing the incidence and improving the prognosis has become the main strategy for the prevention and treatment of colorectal cancer. It has been shown that the colorectal cancer The prognosis is closely related to early diagnosis. For example, in the early diagnosis of colorectal cancer, the postoperative five-year survival rate can reach 80% or more, and the middle and late stage colorectal cancer is less than 40%. Therefore, the colorectal cancer is improved by improving the early diagnosis rate of colorectal cancer. Prognosis has become a feasible measure for the prevention and treatment of colorectal cancer. However, clinical signs such as pain, blood in the stool, weight loss, or intestinal disorders have not been satisfactorily used as clues for early diagnosis of colorectal cancer because colorectal cancer symptoms occur sooner or later with the large intestine. The progression and prognosis of cancer is not necessarily linked. Asymptomatic population screening is to improve the early diagnosis rate of colorectal cancer