Conclusions The extracolonic cancers are the important part in the cancer spectum of HNPCC.Among Chinese families, endometrial and gastric cancers are more common.

• 结论大肠外肿瘤为HNPCC肿瘤谱中的重要成员,中国人的大肠外肿瘤胃癌、子宫内膜癌较多见。