PDCD1 and neoplasm: A high γδ T cell density (above the median value of 6.625 cells/mm2) was associated with younger age (<55 years; p = 0.008); higher histological grade (p = 0.002); adjuvant chemotherapy (p = 0.010); BRCA1 promoter methylation (p = 0.010); TIL, CD3+, and CD8+ cell infiltration (p < 0.001 for all three parameters); PD-L1 expression by tumor cells (p < 0.001) and stromal cells (p < 0.001); and PD-1 expression (p = 0.040).