Emulation of the KEYNOTE-189 Trial Using Electronic Health Records

This is a non-randomized observational study that is being conducted as a part of the Coalition to Advance Real-World Evidence through Randomized Controlled Trial Emulation (CARE) Initiative, a multi-stakeholder collaboration led by Aetion. The study is intended to emulate the trial listed below/above. Although many features of the trial cannot be directly replicated in real-world data sources, key elements of the study design, including outcomes, exposures, and inclusion/exclusion criteria, were selected to proxy those features from the trial as closely as possible. Investigators assume that the trial provides the reference standard treatment effect estimate and that failure to replicate trial findings is indicative of the inadequacy of the real-world data source for replication for a range of possible reasons and does not provide information on the validity of the original trial finding.