Statin Use and Liver Cancer Risk: A Meta-Epidemiological Study of Retrospective Cohort Studies by the Types of Constructed Cohort.

The lack of statistical significance in NPo supports the argument that the conclusions of existing systematic reviews on RSC have low validity. It is necessary to conduct a subgroup meta-analysis of the NPo, NPa, and HPa proposed in this study when conducting a systematic review of RSCs, which will evaluate various outcomes of a specific drug intake with time-varying exposure.