D-1553: A novel KRASG12C inhibitor with potent and selective cellular and in vivo antitumor activity

D-1553 is a small molecule inhibitor selectively targeting KRAS^G12C and currently in phase II clinical trials. Here, we report the preclinical data demonstrating antitumor activity of D-1553. Potency and specificity of D-1553 in inhibiting GDP-bound KRAS^G12C mutation were determined by thermal shift assay and KRAS^G12C -coupled nucleotide exchange assay. In vitro and in vivo antitumor activity of D-1553 alone or in combination with other therapies were evaluated in KRAS^G12C mutated Cancer cells and xenograft models. D-1553 showed selective and potent activity against mutated GDP-bound KRAS^G12C protein. D-1553 selectively inhibited ERK phosphorylation in NCI-H358 cells harboring KRAS^G12C mutation. Compared to the KRAS WT and KRAS^G12D cell lines, D-1553 selectively inhibited cell viability in multiple KRAS^G12C cell lines, and the potency was slightly superior to sotorasib and adagrasib. In a panel of xenograft tumor models, D-1553, given orally, showed partial or complete tumor regression. The combination of D-1553 with chemotherapy, MEK Inhibitor, or SHP2 Inhibitor showed stronger potency on tumor growth inhibition or regression compared to D-1553 alone. These findings support the clinical evaluation of D-1553 as an efficacious drug candidate, both as a single agent or in combination, for patients with solid Tumors harboring KRAS^G12C mutation.