Abstract:
BACKGROUND:Since endoscopic treatment was first evaluated and established as a treatment for patients with early stage gastric carcinoma, metachronous disease recurrence at other sites in the stomach after endoscopic treatment has become a major problem. METHODS:A retrospective case-control study was conducted on 10 patients with metachronous recurrence of gastric carcinoma after undergoing successful endoscopic mucosal resection (EMR) therapy for early stage gastric carcinoma and on 14 patients without recurrence. Gastric mucosal tissues obtained during the initial EMR were dissected, and DNA samples from the tumor tissue and surrounding nonneoplastic mucosa were extracted separately. Microsatellite instability (MSI) was tested in five microsatellite markers (D2S137, D3S1067, TP53, TGFbetaRII, and BAX). The authors also looked for K-ras codon 12 point mutations in the tumor tissues. In addition, immunohistochemical staining was done to test for the presence of proliferating cell nuclear antigen (PCNA), p53, hMSH2, and hMLH1 in the mucosal tissues. Finally, the correlation between the presence or absence of metachronous recurrence and the characteristics of the primary tumor (MSI, K-ras, p53, etc.) were investigated. RESULTS:Three of 10 patients with recurrent disease showed MSI in more than two microsatellite markers among 3-5 investigated site (MSI-H), whereas none of the patients with nonrecurrent disease did so. There was no significant correlation between metachronous recurrence after EMR and immunohistochemical staining reactions, including those for PCNA, p53, hMSH2, and hMLH1. None of the patients showed K-ras mutations. CONCLUSIONS:Thirty percent of patients with recurrent disease showed MSI-H, whereas none of the patients with nonrecurrent disease did so.
journal_name
Cancerjournal_title
Cancerauthors
Kawamura A,Adachi K,Ishihara S,Katsube T,Takashima T,Yuki M,Amano K,Fukuda R,Yamashita Y,Kinoshita Ysubject
Has Abstractpub_date
2001-01-15 00:00:00pages
339-45issue
2eissn
0008-543Xissn
1097-0142pii
10.1002/1097-0142(20010115)91:2<339::AID-CNCR1007>journal_volume
91pub_type
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