NST-628 is a brain-permeable MAPK pathway molecule glue that inhibits RAF phosphorylation and MEK activation. NST-628 also binds RAF and prevents the formation of BRAF-CRAF and BRAF-ARAF heterodimers, effectively inhibiting the RAS-MAPK pathway. NST-628 inhibits RAS- and RAF-driven cancers and demonstrated potent inhibition in mutant KRAS, NRAS, BRAF class II/III, and NF1-mutant tumors.
NST-628 (100 nM; 2 h) has higher antiproliferative activity in BRAF class II/III mutant cell models compared to other RAF and MEK inhibitors, and it does not promote the formation of BRAF and CRAF heterodimers[2].NST-628 (4-100 nM; 48 h) increases the levels of early and late apoptotic cells and reduces the number of live cells in a dose-dependent manner in NRAS mutant IPC-298 and SK-MEL-2, NF1 mutant MeWo, and KRAS mutant HCT116 cell lines[2].
qd: once daily ; b.i.d: twice dailyNST-628 (p.o.; 3 mg/kg; qd, 5 mg/kg; qd, or 1.5 mg/kg; b.i.d) can significantly slow tumor growth in mouse models with KRAS and NRAS mutations. NST-628 also leads to tumor regressions in the SK-MEL-2-luc model[2].NST-628 (i.g.; 0.3-3 mg/kg; qd; 18-20 days) inhibites the RAS-MAPK pathway in mice in a dose-dependent manner. NST-628 also exhibites strong antitumor activity in the MeWo-luc model[2].NST-628 (i.g.; 2 mg/kg; qd; 26 days) slows tumor growth and effectively inhibits the RAS–MAPK pathway in NCI-H23 KRASG12C-mutant lung adenocarcinoma model[2].
References:
[1]. Ryan M B, et al. Abstract ND10: NST-628 is a novel, potent, fully brain-penetrant MAPK pathway molecular glue that inhibits RAS-and RAF-driven cancers[J]. Cancer Research, 2024, 84(7_Supplement): ND10-ND10. [2]. Meagan B et al. The Pan-RAF–MEK Nondegrading Molecular Glue NST-628 Is a Potent and Brain-Penetrant Inhibitor of the RAS–MAPK Pathway with Activity across Diverse RAS- and RAF-Driven Cancers. Cancer Discov 2024