Abstract
Microsatellites are highly polymorphic, short‐tandem repeat sequences dispersed throughout the genome. Instability of these repeat sequences at multiple genetic loci may result from mismatch repair errors, and occurs in hereditary nonpolyposis colorectal carcinoma and certain sporadic cancers. To examine microsatellite instability during the pathogenesis of human prostate cancer, we screened 48 prostate cancer cases (20 stage B, 10 stage C and 18 endocrine therapy‐resistant cancer‐death cases) for replication error at 17 microsatellite marker loci on 9 chromosomes. Microsatellite instabilities were found in 7 of 48 cases (14.6%), and all 7 cases showing the instability were poorly differentiated adenocarcinomas. Moreover, microsatellite instabilities were more frequently observed in cancer‐death cases (6/18, 33%) than in stage B+C cases (1/30, 3.3%). These data suggest that micro‐satellite instability is an important genetic change related to the progression of a subset of human prostate cancer cases. It is suggested to be associated with extensive, concurrent molecular changes including androgen receptor gene mutations, as well as frequent loss of heterozygosity at chromosomal regions 8p, 10q, and 16q.
Keywords: Microsatellite instability, Prostate cancer, Loss of heterozygosity, Genetic alteration
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