CD274 and thymic carcinoma: After further analysis of the correlation between PD-1 and PD-L1, we found that the expression of PD-1 and PD-L1 in thymic carcinoma was positively correlated, thereby indicating that TILs PD-1 together with tumor cell PD-L1 can reflect the activation state of the PD-1/PD-L1 pathway.