GPRC5D and plasma cell myeloma: AEs related to GPRC5D expression on non-myeloma cells were mostly grades 1–2, including skin-related AEs (78% in IV cohort and 86% in SC cohort), mucosal AEs (73% in IV cohort and 77% in SC cohort), and hair or nail changes (23.5% in IV cohort and 28% in SC cohort).