Objective To investigate the clinical significance of screening with colonoscopy and fae- cal occult blood testing(FOBT)in the first grading kinship of patients with colorectal cancer.

• 目的研究大肠癌先证患者的一级亲属的电子肠镜和粪便潜血试验(faecal occultblood testing,FOBT)筛查的临床意义。