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Cancer Lett. 1996 Nov 29;108(2):205-9.

Microsatellite instability in in situ and invasive sporadic breast cancers of Japanese women.

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  • 1Department of Surgery II, Nagoya City University Medical School, Japan.


We studied the timing of microsatellite instability (referred to as replication error; RER) presentation during human breast carcinogenesis using tissue microdissected from both in situ and invasive breast cancers of Japanese women. We analyzed 100 breast cancer specimens for RER at nine genomic loci on seven chromosomes. Eight of the 100 cases (8%) were RER-positive at one or more chromosomal loci. Additionally; we obtained genomic DNA from two of four RER-positive patients with an intraductal component, both of which showed microsatellite instability in in situ foci. This finding indicates that microsatellite instability may be an early event during human breast carcinogenesis.

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