Design, Structure Optimization, and Preclinical Characterization of JAB-21822, a Covalent Inhibitor of KRAS.

KRAS is the most frequently mutated driver oncogene in human cancer, and KRAS mutation is commonly found in non-small-cell lung cancer (NSCLC), colorectal cancer (CRC), and pancreatic ductal adenocarcinoma (PDAC). Inhibitors that covalently modify the mutated codon 12 cysteine have completed proof-of-concept studies in the clinic. Here, we describe structure-based design and cocrystal-aided drug optimization of a series of compounds with the 1,8-naphthyridine-3-carbonitrile scaffold. Biopharmaceutical optimization of the resulting leads to improve the solubility of the compounds and block the possible metabolic hotspots led to the identification of JAB-21822, a covalent KRAS inhibitor with high potency and excellent cross-species pharmacokinetic properties. JAB-21822 has finished the pivotal Phase II clinical trials in NSCLC, and a new drug application was submitted to the National Medical Products Administration in 2024.