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Malignant transformation of Nakamura type IV gastric polyp with CA 19-9 production

Authors
  • Nagai, Kazuki1
  • Ishii, Koji2
  • Matsumaru, Katsuhiko2
  • Kohra, Tetsurou2
  • Okajima, Tsugio2
  • Yamamuro, Wataru2
  • Hatori, Tomoki2
  • Sugimoto, Motonobu2
  • Sumino, Yasukiyo2
  • Nonaka, Hiroko3
  • 1 Department of Internal Medicine, Saiseikai Yokohama-shi Nanbu Hospital, 3-2-10 Konandai, Konan-ku, Yokohama 233, Japan, JP
  • 2 Second Department of Internal Medicine, Toho University School of Medicine, Tokyo, Japan, JP
  • 3 First Department of Pathology, Toho University School of Medicine, Tokyo, Japan, JP
Type
Published Article
Journal
Journal of Gastroenterology
Publisher
Springer-Verlag
Publication Date
Jan 01, 1998
Volume
33
Issue
1
Pages
91–96
Identifiers
DOI: 10.1007/s005350050050
Source
Springer Nature
Keywords
License
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Abstract

In a 68-year-old Japanese man, a gastric polyp 24 mm in diameter with a stalk 15 mm in diameter was diagnosed as well differentiated adenocarcinoma and treated by endoscopic polypectomy. Histologically, most of the resected tissue was adenoma, and atypical cells were papillarily proliferating to form adenocarcinoma in adenoma, a Nakamura type IV gastric polyp. Infiltration of carcinoma was limited to within the mucosal layer. Immunohistochemical study with anti-CA19-9 antibody revealed positive staining in carcinoma cells. Serum CA19-9 level, which showed slight elevation, returned to the normal range 1 month after the polypectomy. The proliferating cell nuclear antigen (PCNA) labeling index and DNA ploidy pattern were analyzed in the resected tissue. The PCNA labeling index was 30% in carcinoma, 17% in adenoma, and 0.1% in the normal tissue. The DNA ploidy pat-tern was diploid in adenoma and aneuploid in adenocarcinoma. These findings suggest that gastric adenoma, as well as colonic adenoma, may have the potential for malignant transformation.

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