CD274 and triple-negative breast carcinoma: Under H2O2 -mediated oxidative stress, the PD-L1-CAR-NK cells demonstrate impaired killing activity against triple-negative breast cancer MDA-MB-231 cells, which was rescued with PRDX1 overexpression in PD-L1-CAR-NK cells, equipping CAR-NK cells with resistance against H2O2 -mediated oxidative stress in IL-15-independent settings.