Immune profiling of tumor-infiltrating T cells and expression of PD-1 and PD-L1 in meGCs. Distribution of TIL subsets and expression of PD-1 and PD-L1 cells in meGCTs. CR: complete response; PR: partial response; P: progression. S, seminoma; D, dysgerminoma; YS, yolk sac tumors; T, teratoma; G, gonadoblastoma; EC, embryonal carcinoma; C, choriocarcinoma.