The prevalence of PD-L2+ expression on any TIL was associated with high %Ki67, ERneg and PRneg BC, the extent of TIL infiltration, a TLS presence, PD-1hi CD8+ TIL, LAG3+ TIL (>1% LAG3+ cells in any TIL subset), and PD-L1+ TIL (Table S8B in Supplementary Material). Here, PDCD1LG2 is linked to breast cancer.