Single-pattern convergence of k-ras mutation correlates with surgical indication of intraductal papillary mucinous neoplasms

Osamu Mizuno, Hirofumi Kawamoto, Naoki Yamamoto, Shigeru Horiguchi, Koichiro Tsutsumi, Masakuni Fujii, Hironari Kato, Ken Hirao, Naoko Kurihara, Etsuji Ishida, Tsuneyoshi Ogawa, Hiroyuki Okada, Kazuhide Yamamoto

Research output: Contribution to journalArticle

11 Citations (Scopus)


Objectives: One or more patterns of 6 K-ras mutations are detected in cells from the pancreatic juice of patients with intraductal papillary mucinous neoplasms (IPMNs). We investigated whether these mutations are associated with malignant progression. Methods: Between January 2002 and December 2007, 53 patients with IPMN were subjected to collection of pure pancreatic juice to evaluate K-ras mutation. According to the histological and radiological findings, the IPMNs were classified into 4 groups: carcinoma group, adenoma group, high-risk group, and low-risk group. We retrospectively investigated the mutation with these groups. Results: In patients with a positive K-ras mutation, a single pattern of K-ras mutation was observed in 80% (8/10) of the carcinoma group, in 71% (5/7) of the adenoma group, in 40% (2/5) of the high-risk group, and in 38% (8/21) of the low-risk group. The rate of a single pattern of K-ras mutation decreased in a stepwise order (P = 0.017). The incidence of a single pattern of K-ras mutation was significantly higher in the patients who received surgical therapy (75%, 12/16) than in those who did not (38%, 10/26; P = 0.033). Conclusions: The present study suggests that the single-clonal convergence of K-ras mutation is associated with the malignant progression of IPMNs.

Original languageEnglish
Pages (from-to)617-621
Number of pages5
Issue number5
Publication statusPublished - Jul 1 2010



  • ERP
  • IPMN
  • K-ras mutation
  • pancreas
  • pancreatic juice
  • surgical indication

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Hepatology
  • Endocrinology

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