Ras gene point mutations in gallbladder lesions associated with anomalous connection of pancreatobiliary ducts

Teruhiko Iwase, Saburo Nakazawa, Kenji Yamao, Junji Yoshino, Kazuo Inui, Hitoshi Yamachika, Naoto Kanemaki, Masao Fujimoto, Kazumu Okushima, Hironao Miyoshi, Norito Taki, Yuta Nakamura, Sayoko Mizutani, Yosimune Horibe, Tuneo Masui, Masae Tatematsu

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Background/Aims: The present study was undertaken to investigate possible changes in the K-ras oncogene in patients with gallbladder lesions (carcinoma, adenoma or hyperplasia) in relation to the presence or absence of an anomalous connection of pancreatobiliary ducts (ACPBD). Methodology: Gallbladder specimens were obtained from 44 patients with lesions that were either with or without ACPBD, and DNA samples were analyzed using PCR-SSCP. Point mutations in codons 12, 13 and 61 were analyzed by direct sequencing methods with oligonucleotide primers. Results: The K-ras codon 12 was detected in 83.3% (5/6) of carcinomas, the one adenoma tested and in 35.7% (5/14) of hyperplastic lesions with ACPBD, as opposed to only 36.4% (4/11) of carcinomas without ACPBD. The one case of gallbladder adenoma and 11 cases of normal gallbladder without ACPBD studied demonstrated no point mutations in the K-ras oncogene. Conclusions: Alteration of the K-ras oncogene appears to be involved in the early stages of gallbladder carcinogenesis when in association with ACPBD. The results further suggest that hyperplasia in cases with ACPBD may be a significant pre-cancerous lesion.

Original languageEnglish
Pages (from-to)1457-1462
Number of pages6
JournalHepato-gastroenterology
Volume44
Issue number17
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • Hepatology
  • Gastroenterology

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