Spiclomazine (Clospirazine) is a potent mutant KRAS(G12C) inhibitor that selectively inhibits mutant KRAS-driven pancreatic cancer. Spiclomazine can eliminate KRas-GTP levels in KRAS-driven pancreatic cancer and effectively inhibit RAS-mediated signaling. Spiclomazine significantly inhibits tumor progression in mouse renal capsule xenotransplantation models[1].