微卫星DNA不稳定性及杂合性缺失和胃癌的血液或淋巴转移的关系

CORRELATION BETWEEN MICROSATELLITE INSTABILITY OR LOSS OF HETEROZYGOSITY AND GASTRIC CANCER METASTASIS

为了明确胃癌的血液或淋巴转移和微卫星ＤＮＡ不稳定性（Ｍｉｃｒｏｓａｔｅｌｉｔｅｉｎｓｔａｂｉｌｉｔｙ，ＭＳＩ）及杂合性缺失（Ｌｏｓｓｏｆｈｅｔｅｒｏｚｙｇｏｓｉｔｙ，ＬＯＨ）的关系，选择２９个多态微卫星ＤＮＡ标记（ＭＳ），采用ＰＣＲ－聚丙烯酰胺凝胶电泳及银染技术，分析了３８例胃癌的ＭＳＩ和ＬＯＨ频率。其中胃癌伴有血液或淋巴转移的２４例；不伴有血液或淋巴转移的１４例，结果表明：总的ＭＳＩ和ＬＯＨ频率分别为２０．８４％和２７．５９％，伴有血液或淋巴转移的胃癌，ＭＳＩ在Ｄ７Ｓ５２０、Ｄ８Ｓ２７９位点频率最高为５４．１７％；ＬＯＨ在Ｄ６Ｓ４３０位点频率最高为６２．５０％。无血液或淋巴转移的胃癌，ＭＳＩ和ＬＯＨ频率均为５７．１％。经χ２检验，ＬＯＨ和ＭＳＩ的发生频率在伴有或不伴有血液或淋巴转移胃癌中，两者无统计学差异。表明胃癌的血液或淋巴转移和ＭＳＩ及ＬＯＨ的发生频率无关，目前还难以以这两个指标作为辅助性的判断预后。

In order to identify the effects of MSI(Microsatellite instability, MSI) and LOH(Loss of heterozygosity, LOH) in gastric cancer metastasis, we selected 29 Microsatellite markers to analyse 38 cases with (24 patients) or without (14 patients) lymphatic permeation for their MSI and LOH. The highest rate of MSI at D7S520 and D8S279 was 54.17%, and the highest rate of LOH at D6S430 was 62.50% in gastric cancer with metastasis. The highest rate of LOH and MSI at D3S1067 in gastric cancer without metastasis was 57.14%. There was no significant difference between them. We think that MSI and LOH can not be used as the indicators of malignant degree and prognosis of gastric cancer.