[CAS NO. 1313725-88-0]  Savolitinib (AZD6094)

In a mouse pharmacokinetic study (male ICR mice), the clearance of the compound is 4.28 L/(h·kg) and the half-time is 1.7 h. Despite its moderate oral bioavailability (F = 27.2%), the overall plasma exposure is much higher. Volitinib demonstrates dose-dependent tumor growth inhibition in a U87MG subcutaneous xenograft model. Its treatment leads to pharmacodynamic modulation of c-MET signaling and potent tumor stasis in 3/3 cMET-dysregulated gastric cancer patient-derived tumor xenograft models, but has negligible activity in a gastric cancer control model. Volitinib has moderate plasma protein binding rate (60%∼70% in rat, dog, and human; 40% in mouse; 80% in monkey) and exhibits wide distribution to different organs in rat, with high exposures in liver and kidney, very low in brain, spinal cord and testis compared to the plasma level. In PK studies in mouse, rat and dog, Volitinib shows the rapid oral absorption (Tmax<2.5 h) with high exposures and the acceptable bioavailability at 27.2%, 42.6% and 86.3%, respectively. The in vivo clearance (CL) is 11.0, 11.8 and 3.5 mL/min/kg in mouse, rat and dog, respectively, revealing a low extraction ratio. The volume of distribution in steady state (Vss) is 0.4, 1.4 and 1.4 L/kg in those species, respectively, indicating a moderate to low distribution pattern. Volitinib also displays linear pharmacokinetics (PK) in the dose ranges of 1 to 25 mg/kg in rat and 2 to 10 mg/kg in dog. Food hardly affects its PK profile in dog. In contrast, volitinib in monkey shows a notably high extraction ratio (CL=17.2 mL/min/kg) consistent with the in vitro metabolism result. Considering the rapid absorption of volitinib (Tmax=1.9 h) and moderately low distribution (Vss=0.7 L/kg), the poor oral bioavailability (1.9%) of volitinib in monkey is considered to be the result of excessive first-pass extraction. Overall, volitinib exhibits favorable preclinical PK/ADME properties.