PDCD1 and thymoma: Analysis of the PD-L1 and PD-1 expression combinations in thymomas revealed that PD-L1low/PD-1high groups exhibited good OS (p = 0.009, log-rank, Supplemental Figure 1B) compared to PD-L1high/PD-1low group; however, no differences in DFS were observed (p = 0.082, log-rank, Supplemental Figure 1A).