In vitro studies revealed that LM-305 binds with high affinity to GPRC5D over-expressing cell lines and GPRC5D endogenously expressing MM cells in a dose-dependent manner….M-305 exhibited complete response (CR) in the GPRC5D high-expressing MM CDX models at a dose of 3mg/kg. Moreover, LM-305 showed good safety profile in the animal studies. In conclusion, this preclinical data suggested that LM-305 is a novel GPRC5D targeting ADC with best-in-class potential, and therefore it can be a promising therapeutic candidate for the treatment of RRMM patients expressing GPRC5D.