[Critical review on the WHO/IARC report regarding carcinogenicity of Helicobacter pylori].
Level 5 - mechanism / opinion, no new human data
Narrative review of epidemiological and experimental evidence with no new human data.
What was done
The author reviewed the 1994 WHO/IARC report that designated Helicobacter pylori as a definite human carcinogen, assessing histological pathways, pooled prospective epidemiological studies, and available experimental evidence for gastric carcinogenesis.
What was found
The review notes that H. pylori causes histological gastritis and that long-lasting infection may induce atrophic gastritis along the gastritis-metaplasia-carcinoma sequence. In a cited pooled analysis of three prospective epidemiological studies, the relative risk for developing gastric cancer with H. pylori infection was 3.8 (statistically significant). However, the abstract reports that experimental evidence for carcinogenicity was lacking.
Why it matters
It outlines the prospective epidemiological evidence used to classify H. pylori as a group 1 carcinogen while noting the absence of experimental animal confirmation at the time of the monograph.
Limits
This is a narrative review rather than a systematic review. The abstract does not report participant sample sizes, confidence intervals, search methodology, or details on confounding control across the cited prospective studies.
Cited by
- supports The World Health Organization estimates that Helicobacter pylori colonization confers a 3- to 6-fold increased risk of gastric cancer.