CD274 and neoplasm: Furthermore, in agreement with the evidence that chemotherapy induces the enrichment of programmed death-ligand 1 (PD-L1)-positive immune-evasive TNBC cells [72], we previously showed a significant increase, in both Cis-Pt-R and Dox-R chemoresistant cell lines, of PD-L1 expression [38], which has an established tumor-intrinsic signaling promoting EMT in TNBC cells [73,74,75,76].