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K-ras mutation in the major duodenal papilla and gastric and colonic mucosa in patients with autoimmune pancreatitis

  • Original Article—Liver, Pancreas, and Biliary Tract
  • Published:
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Abstract

Background

Pancreatic cancer occurs in some patients with autoimmune pancreatitis (AIP). Significant K-ras mutations are frequently detected in the pancreas of AIP patients. AIP may be a pancreatic lesion of IgG4-related systemic disease. Gastric and colonic cancer can occur during the follow up of AIP patients. We examined K-ras mutations in the major duodenal papilla and gastric and colonic mucosa of AIP patients.

Methods

K-ras analysis and/or immunohistochemical study was performed on the tissues of the major duodenal papilla (n = 8), gastric mucosa (n = 5), colonic mucosa (n = 3), pancreas (n = 5), common bile duct (n = 5), and gallbladder (n = 4) of 12 AIP patients.

Results

Significant K-ras mutations were detected in the major duodenal papilla of 4 of 8 cases [GAT (n = 4)], in the gastric mucosa of 2 of 4 cases [AGT (n = 2)], and in the colonic mucosa of 2 of 3 cases [GAT (n = 2)]. Significant K-ras mutations were detected in the pancreas of all 5 cases [GAT (n = 5), in the common bile duct of 4 cases (GAT (n = 2), TGT (n = 1), and GCT/TGT (n = 1)], and in the gallbladder epithelium of 3 cases [GAT (n = 1), GCT (n = 1), and GTT (n = 1)]. K-ras mutations were detected in the organs associated with IgG4-related fibroinflammation with abundant infiltration of T lymphocytes and forkhead box P3-positive cells.

Conclusions

Significant K-ras mutations were frequently detected in the major duodenal papilla and gastric and colonic mucosa of AIP patients. AIP patients may have risk factors for gastric and colonic cancer, but the mechanisms of K-ras mutation and its clinical implications are not clear.

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Acknowledgments

This work was partly supported by The Research Committee on Intractable Pancreatic Diseases provided by Ministry of Health, Labour, and Welfare of Japan.

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Authors and Affiliations

  1. Department of Internal Medicine, Tokyo Metropolitan Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo, 113-8677, Japan

    Terumi Kamisawa

  2. Department of Pathology, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan

    Shin-Ichirou Horiguchi & Yukiko Hayashi

  3. Division of Clinical Development of Biomedical Laboratories, Saitama, Japan

    Xiaoqing Yun & Toshikazu Yamaguchi

  4. Department of Surgery, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan

    Koji Tsuruta

  5. Department of Chemotherapy, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan

    Tsuneo Sasaki

Authors
  1. Terumi Kamisawa
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  2. Shin-Ichirou Horiguchi
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  3. Yukiko Hayashi
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  4. Xiaoqing Yun
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  5. Toshikazu Yamaguchi
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  6. Koji Tsuruta
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  7. Tsuneo Sasaki
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Correspondence to Terumi Kamisawa.

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Kamisawa, T., Horiguchi, SI., Hayashi, Y. et al. K-ras mutation in the major duodenal papilla and gastric and colonic mucosa in patients with autoimmune pancreatitis. J Gastroenterol 45, 771–778 (2010). https://doi.org/10.1007/s00535-010-0211-y

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  • DOI: https://doi.org/10.1007/s00535-010-0211-y

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