Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/ijms22105383
Keywords
PD-1; PD-L1; cancer; progression; metastasis
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This review focuses on the role of the PD-1/PD-L1 immune checkpoint in shaping anti-tumor immunity, as well as recent studies uncovering the potential intrinsic role of PD-L1 in tumors, including its expression features in epithelial-to-mesenchymal transition program, cancer stemness, and oncogenic pathways. Furthermore, it summarizes the prognostic significance of PD-L1 in different tumor types and its oncogenic potential as a regulator of tumor progression and metastasis.
Programmed cell death protein 1 (PD-1)/programmed death-ligand 1 (PD-L1) immune checkpoint has long been implicated in modeling antitumor immunity; PD-1/PD-L1 axis inhibitors exert their antitumor effects by relieving PD-L1-mediated suppression on tumor-infiltrating T lymphocytes. However, recent studies have unveiled a distinct, tumor-intrinsic, potential role for PD-L1. In this review, we focus on tumor-intrinsic PD-L1 signaling and delve into preclinical evidence linking PD-L1 protein expression with features of epithelial-to-mesenchymal transition program, cancer stemness and known oncogenic pathways. We further summarize data from studies supporting the prognostic significance of PD-L1 in different tumor types. We show that PD-L1 may indeed have oncogenic potential and act as a regulator of tumor progression and metastasis.
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