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Updated: Aug 5, 2025

Gastric Mucosa Quantitative Polymerase Chain Reaction Analysis for Detecting Helicobacter pylori and Antibiotic Resistance
Published on: March 7, 2025
Helicobacter pylori, Homologous-Recombination Genes, and Gastric Cancer
Yoshiaki Usui1, Yukari Taniyama1, Mikiko Endo1
1From the Laboratories for Genotyping Development (Y.U., M.E., Y.I., T.A., N.H., S.T., K. Suzuki, Y. Momozawa), Statistical and Translational Genetics (C.T.), and Cancer Genomics (H.N.), RIKEN Center for Integrative Medical Sciences, Yokohama, the Divisions of Cancer Information and Control (Y.U., Y.T., Y.N.K., H.I.) and Cancer Epidemiology and Prevention (Y. Kasugai, I.O., K. Matsuo), Department of Preventive Medicine, Aichi Cancer Center, the Divisions of Cancer Epidemiology (Y. Kasugai, K. Matsuo) and Descriptive Cancer Epidemiology (H.I.), Nagoya University Graduate School of Medicine, Aichi Cancer Center Research Institute (I.I.), and the Department of Endoscopy (T.T., M.T.), Aichi Cancer Center Hospital (Y.N.), Nagoya, the Department of Hematology, Oncology, and Respiratory Medicine, Okayama University Medical School, Okayama (Y.U.), the Laboratory of Microbial Carcinogenesis, Institute of Microbial Chemistry, Microbial Chemistry Research Foundation (M. Hatakeyama), the Department of Genetic Medicine and Services, National Cancer Center Hospital (M. Hirata, K. Sugano, T.Y.), the Division of Molecular Pathology, Department of Cancer Biology, Institute of Medical Science (M. Hirata, Y. Murakami), and the Laboratories of Complex Trait Genomics (Y. Kamatani) and Clinical Genome Sequencing (K. Matsuda), Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, and the Department of Genetic Medicine, Kyoundo Hospital, Sasaki Foundation (K. Sugano), Tokyo, and the Research Center of Infection-Associated Cancer, Institute for Genetic Medicine, Hokkaido University, Sapporo (M. Hatakeyama) - all in Japan; and the Population Health Program, QIMR (Queensland Institute of Medical Research) Berghofer Medical Research Institute, Brisbane, Australia (A.B.S.).
Helicobacter pylori infection significantly increases gastric cancer risk, especially when combined with germline pathogenic variants in homologous-recombination genes. Individuals with both factors face a substantially higher cumulative risk of developing gastric cancer.
Area of Science:
- Genetics and Genomics
- Oncology
- Infectious Diseases
Background:
- Helicobacter pylori infection is a known risk factor for gastric cancer.
- The combined impact of germline cancer-predisposing gene variants and H. pylori infection on gastric cancer risk is under-evaluated.
Purpose of the Study:
- To investigate the association between germline pathogenic variants in 27 cancer-predisposing genes and gastric cancer risk.
- To assess the synergistic effect of these variants and H. pylori infection on gastric cancer development.
Main Methods:
- Analysis of germline pathogenic variants in 27 cancer-predisposing genes in 10,426 gastric cancer patients and 38,153 controls (BioBank Japan).
- Evaluation of combined effects and cumulative risk in 1433 gastric cancer patients and 5997 controls (HERPACC).
Main Results:
- Germline pathogenic variants in nine genes (APC, ATM, BRCA1, BRCA2, CDH1, MLH1, MSH2, MSH6, PALB2) were linked to increased gastric cancer risk.
- A significant interaction was observed between H. pylori infection and pathogenic variants in homologous-recombination genes (RERI=16.01, P=0.02).
- Individuals with H. pylori infection and a pathogenic variant had a 45.5% cumulative gastric cancer risk by age 85, versus 14.4% for H. pylori-infected non-carriers.
Conclusions:
- H. pylori infection modifies gastric cancer risk associated with germline pathogenic variants in homologous-recombination genes.
- This interaction significantly elevates the cumulative risk of gastric cancer.
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