Abstracts of the Breast Cancer Immunotherapy Symposium (BRECIS): Sidra Symposia Series
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Towards targeting PD-1/PD-L1 axis in breast cancer, pre-clinical data
Journal for ImmunoTherapy of Cancer volume 3, Article number: P7 (2015)
PD-L1 is a ligand that upon binding to its receptor (PD-1) on T-cells leads to T-cell anergy/and or apoptosis [1, 2]. We have shown that PD-L1 is expressed in breast cancer where its expression correlates with estrogen receptor (ER) negativity . To understand the mechanism of the constitutive expression of PD-L1 in tumor cells of ER negative cells we used gene-in and out approach, large scale bioinformatics and immunohistochemistry. We have demonstrated that epithelial to mesenchymal transition (EMT) upregulates PD-L1 expression while cells expressing ER downregulates PD-L1, in parallel with reversal of EMT process. Bioinformatics analysis of gene expression signatures of breast tumors showed a significant correlation between EMT score and PD-L1 mRNA expression. Strikingly, very strong association were found between PD-L1 expression and claudin low breast cancer, a subset of breast cancer known to have high EMT score. In conclusion, we have characterized the expression of PD-L1 in breast cancer and we have demonstrated a strong association between PD-L1 expression, EMT status and claudin-Low breast cancer. Our finding will be essential for choosing the appropriate subset of breast cancer patients that will likely benefit from anti-PD-L1 targeted therapy and understand biological changes upon anti-PD-L1 therapy.
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Ghebeh, H., Colak, D., Tulbah, A. et al. Towards targeting PD-1/PD-L1 axis in breast cancer, pre-clinical data. j. immunotherapy cancer 3, P7 (2015). https://doi.org/10.1186/2051-1426-3-S1-P7
- Breast Cancer
- Estrogen Receptor
- Breast Cancer Patient
- Mesenchymal Transition
- Gene Expression Signature