RET-IN-4 is a highly effective and specific RET inhibitor that can be administered orally. It demonstrates remarkable potency, with IC50 values of 1.29 nM, 1.97 nM, and 0.99 nM for inhibiting RET variants including RET (WT), RET (V804M), and RET (M918T), respectively. Moreover, RET-IN-4 exhibits superior selectivity towards kinases JAK2 (IC50 of 4.4 nM) and FLT3 (IC50 of 30.8 nM). Additionally, RET-IN-4 possesses pronounced anticancer properties.
Pralsetinib is a selective and next-generation RET inhibitor (IC50: 0.3-0.4 nM for WTRET, RET mutants V804L, V804M, M918T, and CCDC6-RET fusion). BLU-667 is an effective and selective inhibitor of RET mutations, fusions, and predicted resistant mutants.