In the thymoma group, including eight studies investigating 675 thymoma patients and using “TPS ≥ 1%” as the threshold, the meta-analysis shows a pooled PD-L1-positive ratio of 83% (95% CI, [0.65; 0.93], I2 = 95%, random effect model), which is relatively higher than that in the TC group, which includes 207 TC patients from eight studies (71%, 95% CI [0.64; 0.77], random effect model). Here, CD274 is linked to thymoma.