On December 13, 2024, the Food and Drug Administration approved cosibelimab-ipdl (Unloxcyt, Checkpoint Therapeutics, Inc.), a programmed death ligand-1 (PD-L1) blocking antibody, for adults with metastatic cutaneous squamous cell carcinoma (mCSCC) or locally advanced CSCC (laCSCC) who are not candidates for curative surgery or curative radiation.