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Published in: Breast Cancer Research and Treatment 1/2017

01-02-2017 | Preclinical study

PD-L1 expression and tumor infiltrating PD-1+ lymphocytes associated with outcome in HER2+ breast cancer patients

Authors: Julia Y. S. Tsang, Wai-Ling Au, Kwan-Yin Lo, Yun-Bi Ni, Thazin Hlaing, Jintao Hu, Siu-Ki Chan, Kui-Fat Chan, Sai-Yin Cheung, Gary M. Tse

Published in: Breast Cancer Research and Treatment | Issue 1/2017

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Abstract

Purpose

Clinical trials showing programmed death (PD)-1–PD-ligand 1 (L1) axis as a promising therapeutic target in melanoma and non-small cell lung cancers have made the pathway a focus of recent attention. However, the data regarding PD-L1/PD-1 in breast cancer are inconsistent. Given the heterogeneity of breast cancers, the clinical relevance of PD-L1 and PD-1 tumor infiltrating lymphocytes (TIL) may vary according to subtypes of breast cancer. We aim to investigate PD-L1 expression in a large cohort of breast cancers and analyze its clinico-pathological as well as outcome relationship according to molecular subtypes. Also, we evaluate the relationship of PD-1 TIL and PD-L1 expression with patients’ survival, particularly for breast cancers with high TIL.

Methods and results

Immunohistochemical analysis of PD-L1 on tissue arrays for 1091 breast cancer patients and PD-1 TIL on 97 whole sections was performed. Associations of PD-L1 with luminal cancers (p < 0.001) and features associated with that subtype [lower histologic grade, absence of necrosis, ER, PR, and AR expression (p < 0.001)] were observed. However, in HER2+ breast cancers, PD-L1 was an independent poor prognostic indicator (DFS: HR = 1.866, p = 0.001; OS: HR = 1.517, p = 0.036). Interestingly, HER2+ cancers showed a lower PD-1 TIL level compared to the other high TIL cases (p = 0.011). Cases with low PD-TIL but high PD-L1 expression showed the worst survival. This could be indicative of an active immune suppression by PD-L1 expression.

Conclusions

Our data showed the relevance of PD-L1 expression in HER2+ breast cancer. A combined evaluation of PD-L1 and PD-1 TIL in the prognosis of breast cancer might also be of value in treatment prediction.
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Metadata
Title
PD-L1 expression and tumor infiltrating PD-1+ lymphocytes associated with outcome in HER2+ breast cancer patients
Authors
Julia Y. S. Tsang
Wai-Ling Au
Kwan-Yin Lo
Yun-Bi Ni
Thazin Hlaing
Jintao Hu
Siu-Ki Chan
Kui-Fat Chan
Sai-Yin Cheung
Gary M. Tse
Publication date
01-02-2017
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 1/2017
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-016-4095-2

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