结直肠癌 (ｃｏｌｏｒｅｃｔａｌｃａｎｃｅｒ,ＣＲＣ)是消化系统常见的恶性肿瘤之一 ,可分为遗传性和非遗传性。遗传性结直肠癌有两种 :一种是家族性腺瘤息肉病 (ｆａｍｉｌｉａｌａｄｅｎｏｍａｔｏｕｓｐｏｌｙｐｏｓｉｓ,ＦＡＰ) ,另外一种是遗传性非息肉病性结直肠癌 (ｈ Colorectal cancer (colorectal cancer, CRC) is one of the common malignant tumors of the digestive system, can be divided into genetic and non-genetic. There are two types of hereditary colorectal cancer: one is familial adenomatous polyposis (FAP) and the other is hereditary nonpolyposis colorectal cancer (h