STAMBP and melanoma: Herein, we now describe the pharmacology of the radiotherapeutic α particle-emitting [225Ac]αMSH-PEG-Cy5-C′ dot drug and describe the unexpected contribution of the αMSH-PEG-Cy5-C′ dot nanoparticle platform in an immunocompetent, syngeneic mouse model of melanoma.