期刊
BREAST CANCER RESEARCH AND TREATMENT
卷 171, 期 2, 页码 273-282出版社
SPRINGER
DOI: 10.1007/s10549-018-4834-7
关键词
PD-L1; CD20; Immuno-oncology; Inflammatory breast cancer; Triple-negative; Patient outcome
类别
资金
- Glaxo-SmithKline Oncology Ethnic Research Initiative Grant
- UICC ICRETT fellowship [ICR/09/043]
- National Institutes of Health [CA163890]
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. In multivariate analyses, CD20(+)TILs/PD-L1(+)TILs status was an independent prognostic factor for DFS in IBC (hazard ratio (HR): 0.53, 95% CI 0.37-0.77) and TN IBC (HR: 0.39 95% CI 0.17-0.88), and for BCSS in IBC (HR: 0.60 95% CI 0.43-0.85) and TN IBC (HR: 0.38 95% CI 0.17-0.83). Conclusion CD20(+)TILs/PD-L1(+)TILs status represents an independent favorable prognostic factor in IBC and TN IBC, suggesting a critical role for B cells in antitumor immune responses. Anti-PD-1/PD-L1 and B cell-activating immunotherapies should be explored in these settings.
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