Bayesian Nonparametric Common Atoms Regression for Generating Synthetic Controls in Clinical Trials
提出一种贝叶斯非参数公共原子混合模型，利用电子健康记录数据为单臂试验构建合成对照组，通过无密度重要性抽样实现重采样，在模拟中比替代方法有更高检验功效，并应用于胶质母细胞瘤研究。
The availability of electronic health records (EHR) has opened opportunities to supplement increasingly expensive and difficult to carry out randomized controlled trials (RCT) with evidence from readily available real world data. In this article, we use EHR data to construct synthetic control arms for treatment-only single arm trials. We propose a novel nonparametric Bayesian common atoms mixture model that allows us to find equivalent population strata in the EHR and the treatment arm and then resample the EHR data to create equivalent patient populations under both the single arm trial and the resampled EHR. Resampling is implemented via a density-free importance sampling scheme. Using the synthetic control arm, inference for the treatment effect can then be carried out using any method available for RCTs. Alternatively the proposed nonparametric Bayesian model allows straightforward model-based inference. In simulation experiments, the proposed method exhibits higher power than alternative methods in detecting treatment effects, specifically for nonlinear response functions. We apply the method to supplement single arm treatment-only glioblastoma studies with a synthetic control arm based on historical trials. Supplementary materials for this article are available online.