In addition, a post-hoc analysis of a subset of participants in the Warfarin vs. Aspirin for Recurrent Stroke Study (WARSS) demonstrated no difference between aspirin and warfarin on the risk of stroke or vascular death when NT-proBNP level was ≤750 pg/mL (hazard ratio [HR] 1.21, p=0.243), but warfarin reduced the risk compared to aspirin when NT-proBNP levels were >750 pg/mL (HR 0.30, p=0.021)9. This evidence concerns the gene NPPB and Stroke.