A Phase I Qtc Study Of Tivozanib In Patients With Advanced Solid Tumors.

445 Background: Tivozanib is a potent and selective tyrosine kinase inhibitor of vascular endothelial growth factor receptors-1, -2, and -3 that is currently being tested in a Phase III study in patients with renal cell carcinoma and Phase I/II studies of other solid tumors. Preclinical and retrospective electrocardiogram (ECG) analyses suggest no effect of tivozanib on QTc, although this has not been prospectively assessed according to ICH E14 Cardiac Assessment of New Drugs Guidelines. This open-label, non-randomized, single-arm study prospectively investigated the effect of tivozanib on the QTcF interval and its morphology on the ECG and ECG-pharmacokinetic (PK) relationship in patients with advanced solid tumors.Patients with advanced solid tumors, an ECOG score ≤1 and life expectancy ≥3 months were eligible. Patients received 1.5 mg of tivozanib orally, once daily for 21 days. Serial blood samples and time-matched, triplicate, 12-lead ECGs were collected on: Day 1 20-30 minutes pre-dose (no blood sample collected), immediately pre-dose, and at 2.5, 4, 5, 6, 8, and 10 hours post dose; Day 2 pre-dose evaluation was taken approximately 24 hours post Day 1 dose; Day 8 (±1 day) pre-dose, and at 2.5, 5, and 8 hours post dose; Day 21 pre-dose and at 2.5, 4, 5, 6, 8, and 10 hours post dose; and Day 22 at approximately 24 hours post Day 21 dose. Additional safety parameters were evaluated by assessing clinical laboratory tests, physical examinations, vital signs, and recording of adverse events.Fifty patients with advanced solid tumors (males, 17; median age, 63 years; 94% white) who received ≥ 1 dose of tivozanib were evaluable. Preliminary data showed that there were no clinically significant changes in QTcF from baseline. Further analysis will be completed, and final safety and ECG-PK modeling will be presented.Preliminary data suggest that tivozanib 1.5 mg/d over a 21-day period does not cause clinically significant QT/QTc prolongation over baseline, suggesting that its safety and PK profile is similar to that observed in previous studies, including ECG evaluation in a monkey telemetry study.