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Title
Gastric cancer and Helicobacter pylori: a combined analysis of 12 case control studies nested within prospective cohorts.
Authors
Helicobacter and Cancer Collaborative Group
Abstract
The magnitude of the association between Helicobacter pylori and incidence of gastric cancer is unclear. H pylori infection and the circulating antibody response can be lost with development of cancer; thus retrospective studies are subject to bias resulting from classification of cases as H pylori negative when they were infected in the past.