A small proportion of BC TIL (principally from extensively infiltrated HER2+ and TNBC) expresses both ligands (PD-L1 and PD-L2) on their cell surfaces (Figures 2B and 3B; Figures S2A and S3A and Tables S5, S7B, and S8B in Supplementary Material). The gene discussed is PDCD1LG2; the disease is breast cancer.