CUSP06, a CDH6 ADC, is composed of a proprietary antibody with high CDH6 binding affinity, a protease-cleavable linker, and an exatecan payload (a potent and clinically validated topoisomerase-1 inhibitor). The linker is designed to complement the exatecan payload, enabling a highly stable and homogenous ADC. The payload is a weak substrate for BCRP/P-gp, which are drug efflux pumps that drive chemoresistance to many therapies. In preclinical data, this linker-payload has been shown to have an increased “bystander effect” compared to competitor ADCs. CUSP06 has a drug-to-antibody ratio of eight.

CUSP06-1001 (NCT06234423): A Phase 1, First-in-Human Study of CUSP06, a Cadherin-6 (CDH6)-Directed Antibody-Drug Conjugate, in Patients With Platinum-Refractory/Resistant Ovarian Cancer and Other Advanced Solid Tumors

CUSP02 is a novel bispecific antibody that is designed to have important anti-tumor, immune-targeting and anti-angiogenic properties. This program is currently in early discovery.