Differences of immunophenotypic markers and signaling molecules between adenocarcinomas of gastric cardia and distal stomach.

Abstract

During the past decades, the subsites of gastric carcinoma underwent significant changes. The incidence of the adenocarcinoma at distal stomach has been decreased, whereas cardiac adenocarcinoma remained increasing in many countries. The aim of this study was to investigate the differences between gastric cardiac and distal adenocarcinomas. We detected expressions of cytokeratins (cytokeratins 7, 14, 19, and 20) and mucins (mucins 1, 2, and 5AC) by immunohistochemistry and signaling molecules (p38, mitogen-activated protein kinase-interacting kinase 1 (MNK1), extracellular signal-regulated kinase, Jun N-terminal kinase, and phosphoinositide 3 kinase) by reverse transcription-polymerase chain reaction in both groups. The incidence of mucin 2 expression was lower in total (50.0%) and advanced-stage cases (52.0%) with cardiac adenocarcinomas than those in distal cases with total (70.2%) and advanced stage (71.4%), respectively. However, the staining for cytokeratin 14 was also significantly higher in total or advanced-stage tumors from the cardia. Our data showed no significant difference of cytokeratin 7/cytokeratin 20 pattern between 2 groups, but cytokeratin 20 expression was significantly higher in advanced-stage carcinomas of the cardia (58.7%) than in distal ones with advanced stage (38.3%). A multivariate analysis demonstrated different relationships between immunophenotypic markers and pathologic parameters in adenocarcinomas of the cardia and distal stomach. Moreover, significantly lower expressions of MNK1 and p38 in cardiac tumors were also detected. In summary, we found significant differences in patterns of immunophenotypic markers and expressions of signaling molecules between the 2 groups. It is indicated that adenocarcinoma of the cardia was different in histotype and histologic origin from distal adenocarcinoma. The cardiac adenocarcinoma might be a special subtype or an independent entity of gastric carcinoma in China.

• Authors: Liying Xue, Xianghong Zhang, Yuehong Li, Haiyan Yang, Xuemin Li, Jianmin Mi, Hengshu Wang, Junling Wang, Xia Yan
• Journal: Human pathology (Hum Pathol) Vol. 42 Issue 4 Pg. 594-601 (Apr 2011) ISSN: 1532-8392 [Electronic] United States
• PMID: 21146193 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 Elsevier Inc. All rights reserved.

Chemical References

• Biomarkers, Tumor
• Keratin-20
• Keratin-7
• Mucins

Topics

• Adenocarcinoma (epidemiology, metabolism, pathology)
• Biomarkers, Tumor (analysis, metabolism)
• Cardia (metabolism, pathology)
• Humans
• Immunohistochemistry
• Keratin-20 (biosynthesis)
• Keratin-7 (biosynthesis)
• Mucins (biosynthesis)
• Neoplasm Staging
• Pyloric Antrum (metabolism, pathology)
• Reverse Transcriptase Polymerase Chain Reaction
• Signal Transduction (physiology)
• Stomach Neoplasms (epidemiology, metabolism, pathology)