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Diagn Mol Pathol. 2001 Sep;10(3):166-70.

Genotyping of Helicobacter pylori strains in formalin-fixed or Formaldehyde-sublimate-fixed paraffin-embedded gastric biopsy specimens.

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Department of Pathology, Slotervaart Hospital Amsterdam, The Netherlands.


Different genotypes of Helicobacter pylori can play a role in the development of atrophic gastritis, peptic ulcer disease, and gastric carcinomas. In this study the authors developed polymerase chain reaction assays for the detection and identification of vacA (s- and m-regions), cagA, and iceA genotypes of H. pylori in formalin-fixed or formaldehyde-sublimate-fixed paraffin-embedded gastric biopsy specimens. Polymerase chain reaction products were analyzed by reverse hybridization on a line-probe assay. Complete genotyping was achieved in 26 of 28 samples (93%), and multiple genotypes, indicating the presence of multiple strains, were detected in nine samples (32%). This genotyping method offers the possibility for long-term retrospective studies on H. pylori genotypes and gastric pathology in the same archival gastric tissue specimens.

[Indexed for MEDLINE]

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