Information GSK3179106 GSK3179106 is a potent, selective, and gut-restricted pyridone hinge binder small molecule RET (c-RET) kinase inhibitor with a RET IC50 of 0.3 nM and is efficacious in vivo. Targets RET (Cell-free assay) 0.3 nM In vitro GSK3179106 has a clean genotoxic profile with no embedded genotoxicity liabilities and possesses good kinase selectivity: only 26 out of a set of >300 recombinant kinases are found to be inhibited at a 1 μM test concentration. In vivo Single dose IV (bolus, 0.06 mg/kg) PK in male Sprague-Dawley rats of compound GSK3179106 formulated as 0.04 mg/mL in DMSO/6% HP-beta-CD = 5:95 with a pH of 7 as a clear solution shows low exposure with an AUC of 102 ng·h/mL. Oral PK is evaluated with the same dosing regimen as the in vivo colonic hypersensitivity model, seven doses of 10 mg/kg given over 3.5 days. Full gut PK measurements are also taken to help understand the PK/PD relationship--It reveals high concentrations of GSK3179106 in the colon contents, jejunum, duodenum, and ileum, over that in plasma.