Fig. 5From: PD-L1 expression is a predictive biomarker for CIK cell-based immunotherapy in postoperative patients with breast cancerImmunohistochemical analysis of PD-L1 expression in surgical breast cancer specimens. Positive cases are determined based on the percentage of tumor cells with membranous PD-L1 staining. a, b PD-L1-negative expression and (c, d) PD-L1-positive expression. PD-L1 staining is shown by the brown chromogen. (a and c, 200×magnification; b and d, 400×magnification)Back to article page