Results The overall positive rate of MSI in CRC were 47.2%(25/53). 23 case(23/53,43.4%) have MSI at 2 or more than 2 loci which showed DNA replication error(RER)-positive.

• 结果53例大肠癌中25例存在微卫星不稳定；总阳性率为47.；2%25；其中23例存在2个以上位点的MSI；呈复制误差阳性(RER阳性)；占43