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[Cancer Research 59, 159-164, January 1, 1999]
© 1999 American Association for Cancer Research
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[Cancer Research 59, 159-164, January 1, 1999]
© 1999 American Association for Cancer Research

Molecular Biology and Genetics

hMLH1 Promoter Methylation and Lack of hMLH1 Expression in Sporadic Gastric Carcinomas with High-Frequency Microsatellite Instability1

Suet Yi Leung2,, 3, Siu Tsan Yuen2, Lap Ping Chung, Kent Man Chu, Annie S. Y. Chan and Joana C. I. Ho

Departments of Pathology [S. Y. L., S. T. Y., L. P. C., A. S. Y. C., J. C. I. H.] and Surgery [K. M. C.], The University of Hong Kong, Queen Mary Hospital, Hong Kong

Mutation of DNA mismatch repair genes has rarely been documented in sporadic gastric carcinoma with microsatellite instability (MSI). In sporadic colorectal carcinoma, hMLH1 promoter methylation associated with protein loss is found in the majority of high-frequency MSI cases. We investigated a series of 35 sporadic gastric carcinomas stratified into high-frequency MSI (MSI-H), low-frequency MSI (MSI-L) and microsatellite stable (MSS) groups and found that hypermethylation of the CpG island in the hMLH1 promoter region was present in 100% of MSI-H sporadic gastric carcinomas. In 90% of cases, there was an associated complete loss of hMLH1 protein, as detected by immunohistochemistry, and a markedly lowered hMLH1 mRNA level. This loss of hMLH1 protein occurred in the MSI-H invasive tumor but not in the adjacent carcinoma-in situ or dysplastic components that were MSS. The MSI-L and MSS forms of gastric carcinoma all showed predominantly unmethylated hMLH1 promoter, positive hMLH1 protein and high hMLH1 mRNA level. On the other hand, hMSH2 protein was expressed in all of the tumors irrespective of the MSI status. Our results suggest that high-frequency MSI in sporadic gastric cancer is mostly due to epigenetic inactivation of hMLH1 in association with promoter methylation, and the loss of hMLH1 protein is a significant event in the development of invasive tumor.




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