Fig. 3From: Immune response in breast cancer brain metastases and their microenvironment: the role of the PD-1/PD-L axisKaplan-Meier curves for overall survival (OS) after excision of breast cancer bone metastases (BM). a Programmed cell death protein 1 receptor (PD-1)-positive vs. PD-1-negative stromal tumor infiltrating lymphocytes (TILs) in the brain microenvironment. b high vs. low macrophage/microglia infiltration (CD68+) in the brain microenvironment. HR hazard ratioBack to article page