Several studies have shown that thymic tumor epithelial cells exhibit high programmed cell death-ligand 1 (PD-L1) expression, with PD-L1 expression in thymomas reaching 23–68% [65,67,68,69], suggesting that immune checkpoint inhibitors (ICIs) targeting PD-L1 have some promise for the treatment of thymomas. Here, CD274 is linked to neoplasm.