Session: 802. Chemical Biology and Experimental Therapeutics: Poster III
Hematology Disease Topics & Pathways:
Apoptosis, Research, Drug development, Translational Research, Treatment Considerations, Non-Biological therapies, Biological Processes, Technology and Procedures
ABBV-453, a next-generation BCL-2 inhibitor, was designed for enhanced molecular and biological properties to improve upon the patient experience relative to available therapies. Specifically, incorporation of macrocyclic elements into the hot-spot binding regions of BCL-2 afforded a constrained molecule with high potency, selectivity and durable in vivo activity at low doses. In vitro, ABBV-453 possesses sub-nM affinity for BCL-2 (KI = 0.228 nM) and high selectivity over family members BCL-XL and MCL-1. The high affinity and selectivity of ABBV-453 translates to potent cell killing activity human tumor cell lines dependent upon BCL-2, including the acute lymphocytic leukemia (ALL) cell line RS4;11 (EC50 = 4.7 nM in the presence of 10% human serum), and greatly decreased activity in human tumor cell lines dependent on BCL-XL (Molt-4 EC50 = 2.85 µM) and MCL-1 (H929 EC50 >10 µM) for survival. Moreover, the cellular activity of ABBV-453 is on-target and mechanism-based as demonstrated by the disruption of BCL-2:BIM complexes and the rapid activation of the intrinsic apoptosis signaling pathway (as evidenced by caspase-3-7 activation and dissipation of the inner mitochondrial membrane potential) and the caspase dependent externalization of annexin-V at the plasma membrane of ABBV-453 treated tumor cells.
Activity of ABBV-453 monotherapy was compared to other clinically relevant BCL-2 inhibitors in an in vivo subcutaneous xenograft model of ALL. ABBV-453 demonstrated superior growth inhibition of the RS4;11 xenograft compared to both sonrotoclax or lisaftoclax at equivalent doses and schedule. ABBV-453 has the potential to be the best-in-class next-generation BCL-2 inhibitor and is actively being investigated in phase 1 clinical trials in relapsed or refractory (R/R) MM (ClinicalTrials.gov ID, NCT05308654) and R/R CLL/SLL (NCT06291220).
Disclosures: Phillips: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company, Patents & Royalties. Robles-Cardona: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Alvey: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Ingram: AbbVie Inc: Ended employment in the past 24 months. Lam: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Yang: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Riehm: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Chen: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Kurnick: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Kovar: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Wang: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company. Doherty: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company, Patents & Royalties. Bhat: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company, Patents & Royalties. Dai: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company, Patents & Royalties. Judd: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company, Patents & Royalties. Souers: AbbVie Inc: Current Employment, Current equity holder in publicly-traded company, Patents & Royalties.
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