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目的探讨微卫星ＤＮＡ不稳定性（Ｍｉｃｒｏｓａｔｅｌｌｉｔｅ ｉｎｓｔａｂｉｌｉｔｙ．ＭＳＩ）与遗传性非息肉病性大肠癌（Ｈｅｒｃｄｉｔａｒｙｎｏｎｐｏｌｙｓｉｓｃｏｌｏｒｅｃｔａｌｃａｎｃｅｒ，ＨＮＰＣＣ）的关系。方法采用银染ＰＣＲ－ＳＳＣＰ方法，检测４例遗传性非息肉病性大肠癌及其相应正常组织的第２、５、１７号染色体的４个位点的ＭＳＩ．结果４例ＦＩＮＰＣＣ均存在至少一个位点的ＭＳＩ。ＨＮＰＣＣ多位于右半结肠，低分化，粘液腺癌多见。结论ＭＳＩ是ＨＮＰＣＣ常见的分子学事件。ＨＮＰＣＣ有其特有的生物学特性。
Objective To investigate the relationship between microsatellite instability (MSI) and hereditary nonpolyposis colorectal cancer (HNPCC). Methods The MSI of four loci on chromosomes 2, 5, and 17 of four cases of hereditary non-polyposis colorectal cancer and its corresponding normal tissues were detected by silver staining PCR-SSCP. Results There were at least one site of MSI in all 4 cases of FINPCC. HNPCC mostly located in the right colon, poorly differentiated, more common mucinous adenocarcinoma. Conclusion MSI is a common molecular event of HNPCC. HNPCC has its unique biological characteristics.