Purpose The purpose of the study was to evaluate protein expression of PD-L1 and CD20 as prognostic biomarkers of patient outcome in inflammatory breast cancer (IBC) samples. Methods PD-L1 and CD20 protein expression was measured by immunohistochemistry in 221 pretreatment IBC biopsies. + + PD-L1 was assessed in tumor cells (PD-L1 tumor cells) and tumor stromal infiltrating lymphocytes (PD-L1 TILs); CD20 was scored in tumor-infiltrating B cells. Kaplan–Meier curves and Cox proportional hazard models were used for survival analysis. + + + + Results PD-L1 tumor cells, PD-L1 TILs, and CD20 TILs were found in 8%, 66%, and 62% of IBC, respectively. PD-L1 tumor cells strongly correlated with high TILs, pathological complete response (pCR), CD20 TILs, but marginally with + + breast cancer-specific survival (BCSS, P = 0.057). PD-L1 TILs strongly correlated with high TILs, CD20 TILs, and longer disease-free survival (DFS) in all IBC and in triple-negative (TN) IBC (P < 0.035). IBC and TN IBC patients with + + + + tumors containing both CD20 TILs and PD-L1 TILs (CD20 TILs/PD-L1 TILs) showed longer DFS and improved BCSS + + (P < 0.002) than patients lacking both, or those with either CD20 TILs or PD-L1 TILs alone.
Breast Cancer Research and Treatment – Springer Journals
Published: Jun 1, 2018
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