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Cancer

Antibiotic Resistance in Helicobacter pylori Strains Worsens Gastric Cancer Prevention Efforts in China

Strategic Insights

— 2 min read

Research published in the Journal of Clinical Microbiology has highlighted the growing concern of antibiotic resistance in Helicobacter pylori strains, particularly in a high-risk area for gastric cancer in China. The study, conducted by a team of scientists from the CAS Key Laboratory of Molecular Virology and Immunology, aimed to profile the genomic characteristics of these strains and explore variants associated with resistance. The research found that the increasing antibiotic resistance of Helicobacter pylori has had a serious impact on gastric cancer prevention, necessitating a deeper understanding of the genetic mechanisms behind this resistance.

Key Takeaways:

  • The study isolated 153 strains from a community-based cohort and assessed their susceptibility to six antibiotics by MIC Test Strip and genomic characteristics by whole-genome sequencing.
  • Phylogenetic analysis identified the strains as an independent cluster within the East Asian population (hpEastAsia), with the efflux pump gene showing the highest differentiation in the Linqu strains compared with other Chinese strains.
  • Bacterial genome-wide association study (GWAS) identified 86 resistance variants covering 44 genes, including novel resistance variants in and for metronidazole, for clarithromycin, for levofloxacin, and for rifamycin.
  • Two newly identified mutations (R229K and A283V) showed significant associations with metronidazole (p = 0.012) and tetracycline (p = 0.044) resistance, respectively.
  • Optimized resistance prediction panels, including novel mutations and GWAS variants, were established to improve the prediction performances for single antibiotic and double-drug combination resistance compared with traditional literature-reported mutations.
  • The study identified relative genetic independence and high differentiation in the representative strains from a population with high risk of gastric cancer and high prevalence of antibiotic resistance.

Statistics:

  • 153 strains were isolated from a community-based cohort for antibiotic susceptibility testing and genomic characterization.
  • 86 resistance variants were identified through bacterial genome-wide association study (GWAS), covering 44 genes.
  • 44 genes were associated with antibiotic resistance in Helicobacter pylori strains.
  • 2 new mutations (R229K and A283V) were identified as significant associations with metronidazole and tetracycline resistance, respectively.
  • Optimized resistance prediction panels showed improved prediction performances with area under the receiver operating characteristic curves (AUC) of 0.82-0.93.

Sources:

  • NewsRx. CAS Key Laboratory of Molecular Virology and Immunology Reports Findings in Helicobacter pylori (Population structure of Helicobacter pylori and antibiotic resistance-associated variants in a high-risk area of gastric cancer). Chemicals & Chemistry. May 30, 2025; p 248.
  • Journal of Clinical Microbiology. Population structure of Helicobacter pylori and antibiotic resistance-associated variants in a high-risk area of gastric cancer. 2025;63(5).

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