RET agonist BT44 is a novel, specific RET agonist, promotes RET phosphorylation and selectively activates downstream cascades in the cells expressing GFL receptors.BT44 has no effect on TrkA and TrkB receptors; In GFRα1/RET expressing cells, 10–50 µM of BT44 increased the activity of luciferase reporter by approximately two fold (P<0.0001).BT44 dose-dependently stimulated neurite outgrowth from DRG sensory neurons and its efficacy was comparable to that of ARTN.BT44 alleviated mechanical hypersensitivity in surgery- and diabetes-induced rat models of neuropathic pain.

SYHA1815 (SYHA-1815) is a novel potent, selective RET inhibitor, inhibits the kinase activity of RET wild type (IC50=0.9 nM) and V804 mutant (IC50=3.1 nM).SYHA1815 demonstrated approximately 20-fold selectivity for RET over KDR, exhibited a favorable selectivity profile, with> 100-fold selectivity over 347 kinases, and >10-fold selectivity over 44 other kinases in a panel of 395 kinases.SYHA1815 significantly inhibited RET phosphorylation and activation of its key adaptor protein SHC and the downstream signaling molecules p-AKT and p-ERK1/2 in classical RET mutant-driven MTC cell line TT (RETC634W), effectively inhibited p-RET, p-SHC, and downstream p-AKT and p-ERK activity.SYHA1815 inhibited RET-induced cell proliferation and overcame V804 mutants (TT cell proliferation IC50<1.6 nM), suppressed RET-driven cell proliferation via cell-cycle arrest through c-Myc downregulation.SYHA1815 showed potent antitumor efficacy against RET- and RET gatekeeper mutant-driven cancers in vivo.

Pyrazoloadenine is a potent RET (REarranged during Transfection) lung cancer oncoprotein inhibitor. Pyrazoloadenine shows anticancer activity.

HSN608 (HSN 608) is a potent inhibitor of RET solvent-front mutants, inhibits RET G810 solvent-front mutants and the V804M gatekeeper mutant with IC50 of <50 nM in cell culture, inhibits ABL1(T315I) with IC50 of 40.7 nM.