FGTI-2734 Inhibits ERK Reactivation to Overcome Sotorasib Resistance in KRAS G12C Lung Cancer

Abstract

KRAS G12C targeted therapies, such as sotorasib, represent a major breakthrough, but overall response rates and progression-free survival for patients with KRAS G12C lung cancer are modest due to the emergence of resistance mechanisms involving adaptive reactivation of ERK, which requires wild-type (WT) HRAS and NRAS membrane localization. Here, we demonstrate that the dual farnesyltransferase (FT) and geranylgeranyltransferase-1 (GGT-1) inhibitor FGTI-2734 inhibits WT RAS membrane localization and sotorasib-induced ERK feedback reactivation, and overcomes sotorasib adaptive resistance. The combination of FGTI-2734 and sotorasib is synergistic at inhibiting the viability and inducing apoptosis of KRAS G12C lung cancer cells, including those highly resistant to sotorasib. FGTI-2734 enhances sotorasib's anti-tumor activity in vivo leading to significant tumor regression of a patient-derived xenograft (PDX) from a patient with KRAS G12C lung cancer as well as several xenografts from highly sotorasib-resistant KRAS G12C human lung cancer cells. Importantly, treatment of mice with FGTI-2734 inhibited sotorasib-induced ERK reactivation in KRAS G12C PDX, and treatment of mice with the combination of FGTI-2734 and sotorasib were also significantly more effective at suppressing in vivo the levels of P-ERK in sotorasib-resistant human KRAS G12C lung cancer xenografts as well as a PDX. Our findings provide a foundation for overcoming sotorasib resistance and potentially improving the treatment outcomes of KRAS G12C lung cancer.