WAY 316606WAY 316606 is a sFRP-1 (Secreted frizzled-related proteins) inhibitor (Ki=80 nM); an endogenous antagonist of the secreted glycoprotein Wnt. IC50 value: 80 nM (Kd); 0.65 uM (EC50)Target: sFRP-1 Research showed that WAY 316606 bound to sFRP-1 with a K(D) of 0.08 microM and inhibited it with an EC(50) of 0.65 microM. WAY 316606 increased total bone area in a murine calvarial organ culture assay at concentrations as low as 0.0001 microM. Antiosteoporotic agents.