Pralsetinib

Pralsetinib (BLU-667) is a highly potent, selective RET inhibitor. Pralsetinib (BLU-667) inhibits WT RET, RET mutants V804L, V804M, M918T and CCDC6-RET fusion with IC₅₀s of 0.4, 0.3, 0.4, 0.4, and 0.4 nM, respectively^[1]. IC50 & Target:IC50: 0.4 nM (Wild type RET), 0.3 nM (RET V804L), 0.4 nM (RET V804M), 0.4 nM (RET M918T), 0.4 nM (CCDC6-RET)^[1] In Vitro: Pralsetinib (BLU-667) demonstrates more than 10-fold increased potency over approved MKIs against oncogenic RET variants and resistance mutants^[1].
Pralsetinib (BLU-667) demonstrates potent activity (IC₅₀=0.4 nM) against common oncogenic RET alterations, including RET M918T, an activating mutation found in MTC, as well as the CCDC6-RET fusion observed in PTC and NSCLC^[1].
Pralsetinib (BLU-667) suppresses RET pathway signaling in a panel of RET-driven cell lines: LC2/ad (CCDC6-RET, NSCLC), MZ-CRC-1 (RET M918T, MTC), and TT (RET C634W, MTC)^[1]. In Vivo: Pralsetinib (BLU-667) potently inhibits growth of NSCLC and thyroid cancer xenografts driven by various RET mutations and fusions without inhibiting vascular endothelial growth factor receptor 2 (VEGFR-2)^[1].
Pralsetinib (BLU-667) shows dose dependent activity against both KIF5B-RET Ba/F3 and KIF5B-RET V804L Ba/F3 allograft tumors with doses as low as 10 mg/kg twice-daily^[1].