A retrospective record-linkage study (RLS) based on medical records containing drug prescription histories involves immortal time bias (ITB). Thus, it is necessary to control for this bias in the research planning and analysis stages. Furthermore, a summary of a metaanalysis including RLSs that did not control for ITB showed that specific drugs had a preventive effect on the occurrence of the disease. Previous meta-analytic results of three systematic reviews evaluating the association between statin intake and gastric cancer risk showed that the summary hazard ratio (sHR) of the RLSs was lower than 1 and was statistically significant. We should consider the possibility of ITB in the sHR of RLSs and interpret the results carefully.
Summary
Korean summary
이차자료를 활용하여 구축한 코호트 추적연구는 immortal time bias가 개입될 개연성을 염두에 두어야 한다. 이들 연구결과들을 제외한 메타분석 결과 스타닌 복용에 따른 위암발생 위험 감소는 관련성이 없다는 결과를 도출하였다.
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