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Lack of microsatellite instability in neoplasms of ampulla of Vater
Author(s) -
Park Sunhoo,
Kim Sun Whe,
Kim Sun Hee,
Darwish Nevine S.,
Kim Woo Ho
Publication year - 2003
Publication title -
pathology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 74
eISSN - 1440-1827
pISSN - 1320-5463
DOI - 10.1046/j.1440-1827.2003.01534.x
Subject(s) - microsatellite instability , ampulla of vater , ampulla , dna mismatch repair , frameshift mutation , pathology , biology , neoplasm , carcinogenesis , microsatellite , carcinoma , cancer research , medicine , colorectal cancer , mutation , cancer , gene , genetics , anatomy , allele
To clarify the genetic background of ampullary neoplasm, we investigated the occurrence of microsatellite instability (MSI) in 64 samples of neoplasm of the ampulla of Vater. Eight out of 22 adenomas (34.6%), nine out of 32 carcinomas (28.1%) and one metastatic lesion (10.0%) showed MSI in 1–3 of the nine dinucleotide markers; those cases are categorized into microsatellite instability‐low (MSI‐L). The remaining samples were stable with respect to all of the tested markers. None of the samples showed a frameshift mutation in the poly A‐tract of BAT‐26 or transforming growth factor‐β type II receptor , which are frequently mutated in gastric or colorectal cancers showing microsatellite instability. To confirm our finding, we stained 93 ampullary neoplasms with antibodies against the mismatch repair proteins: hMLH1 and hMSH2. All tumors were found to express mismatch repair proteins. In contrast to gastric or colorectal cancers, MSI does not play an important role in the carcinogenesis of ampullary carcinoma.