Abstract
Background
Programmed death-ligand 1 (PD-L1) expression on immune cells (ICs) is a predictive marker for PD-L1 checkpoint blockade in patients with triple-negative breast cancer (TNBC). However, the level of PD-L1 expression and the percentage of cells that are PD-L1+ are continuous variables not dichotomous variables for tumor-infiltrating lymphocytes (TILs) and other cells.
Methods
Multiplexed immunohistochemistry was applied to 31 archived surgical specimens from untreated TNBC patients. TIL levels were visually scored, and CD8+ T cells and PD-L1+ ICs were quantified using an automated multispectral imaging system. PD-L1 expression was assessed within a multiplexed context (CD8 combined spectral composite).
Results
The mean value of stromal TILs (i.e., the percentage of the stromal area with a dese mononuclear infiltrate) was 20%. The frequency of patients with PD-L1-positive tumor cells (TC) and ICs was 38.7% and 32.2%, respectively, with a significant association between them. TIL levels were correlated with CD8+ T cell infiltration in the stroma (Spearman r = 0.795, p < 0.0001). PD-L1 expression on IC was significantly associated with TIL levels (Spearman r = 0.790, p < 0.001) and infiltration of CD8+ T cells (Spearman r = 0.683, p < 0.0001).
Conclusions
The level of PD-L1 on IC was correlated with the level of PD-L1 on TC as well as TIL levels and infiltration of CD8+ T cells. These results suggest that high PD-L1 on IC may reflect T cell-inflamed tumors with the amount of TILs present, including the CD8+ T cells required for anti-tumor responses.
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Acknowledgements
We thank Mamoru Nomura at Perkin Elmer Japan for the excellent technical assistance.
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This study was supported by a grant from the Japanese Breast Cancer Society.
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Sugie, T., Sato, E., Miyashita, M. et al. Multispectral quantitative immunohistochemical analysis of tumor-infiltrating lymphocytes in relation to programmed death-ligand 1 expression in triple-negative breast cancer. Breast Cancer 27, 519–526 (2020). https://doi.org/10.1007/s12282-020-01110-2
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DOI: https://doi.org/10.1007/s12282-020-01110-2