Long term use of proton pump inhibitors and risk of stomach cancer: population based case-control study in five Nordic countries

The study included 17 232 cases of gastric (non-cardia) adenocarcinoma and 172 297 controls. Long term proton pump inhibitor use occurred in 1766 (10.2%) cases and 16 312 (9.5%) controls. No association was found between long term proton pump inhibitor use and gastric adenocarcinoma (adjusted odds 1.01, 95% confidence interval 0.96 to 1.07).