Abstract 5132: Discovery and preclinical evaluation of a potent, orally bioavailable, highly selective, small molecule non-covalent KRASG12D inhibitor

Abstract KRASG12D oncogenic mutation is present in ∼35% of pancreatic, 13% of colorectal, and 4% of non-small cell lung cancers. The mutation also occurs in other cancer types, albeit less frequently. Here we would like to present compelling evidences that ZE98-0277 has potent and selective activity in KRASG12D mutant cell lines and in vivo models. ZE98-0277 drug candidate demonstrates strong in vitro activity (IC50 KRASG12D 6.3 nM) and oral PK, bioavailability ∼20-40% in mice and monkeys, broad therapeutic window (100x in cellular models), good safety and tolerability, favorable ADME properties (solubility, stability, permeability, low hERG inhibition, minimal off-target effects), effective tumor suppression in multiple mouse xenograft models. These preclinical results demonstrate that ZE98-0277 is a potent, selective, and orally bioavailable KRASG12D inhibitor, strongly efficacious against KRASG12D mutant tumors slated for further development. Citation Format: Alexei Pushechnikov, Volodymyr Kysil, Ruben Karapetian, Stepan Mochalov, Aleksei Riakhovskii, Elena Bulanova, Nikolay Savchuk, Iain Dukes. Discovery and preclinical evaluation of a potent, orally bioavailable, highly selective, small molecule non-covalent KRASG12D inhibitor abstract. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 5132.