CD274 and ischemic stroke: Finally, 14 studies, containing 2865 cases and 3227 controls, investigating the PD-L1 R219K C>G and the risks of ischemic stroke were included in the present meta-analysis (Fig. 1) [14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28].