目前，由遗传因素导致的大肠癌约占全部大肠癌病人的２０％。其中１％来源于家族性息肉病，５％～１０％来源于遗传性非息肉性大肠癌（ｈｅｒｅｄｉｔａｒｙｎｏｎｐｏｌｙｐｓｉｓｃｏｌｏｒｅｃｔｏｒｃａｒｃｉｎｏｍａ，ＨＮＰＣＣ），其余为散发的有家族遗传性的大... At present, colorectal cancer caused by genetic factors accounts for about 20% of all colorectal cancer patients. Of these, 1% were from familial polyposis, 5% to 10% were from hereditary nonpolypolysaccharid colorectal cancer (HNPCC), and the rest were distributed with family-infected large...