Several studies focusing on PD‐L1 expression in tumor cells of thymic epithelial neoplasms have shown that the PD‐L1‐positivity rate in the tumor cells tends to be higher in type B thymoma and thymic SCC cases than in type A or AB thymoma cases.34, 36, 37, 38, 39, 40, 41, 42, 43 The results of PD‐L1 expression in typical thymoma and thymic SCC cases of the present study are similar to those obtained in previous studies. This evidence concerns the gene CD274 and thymoma.