PDCD1 and breast cancer: Overall, the data presented here confirm and extend our recent findings linking PD-1+ TIL and PD-L1 expression [IHC (9)], by acquiring PD-1, PD-L1 and PD-L2 FACS expression analysis of fresh tissues and correlating these data with the extent of TIL and a TLS presence and other clinicopathological parameters in a new, independent prospective series of untreated primary BC.