Abstract
TPS4146 Background: Blockade of vascular endothelial growth factor (VEGF) signaling in HCC has been shown in preclinical models with monoclonal antibodies and small molecule multikinase inhibitors, and in clinical trials with SOR, to have anti-tumor activity and improve survival. RAM, a fully human monoclonal antibody, binds to the VEGF receptor-2 (VEGFR-2), potently blocks the binding of the VEGF ligand to VEGFR-2, inhibits VEGF-stimulated activation of VEGFR-2, and neutralizes VEGF-induced mitogenesis of human endothelial cells. In a single-arm, Phase 2 study of RAM as 1st-line monotherapy in 42 pts with advanced HCC (Zhu, ILCA 2010, abstr. O-033), preliminary results included median progression-free survival (PFS) of 4 months (m), time to progression (TTP) of 4.2 m, overall survival (OS) of 12 m and disease control rate of 70% (best overall response: 10% partial response, 60% stable disease). Methods: Pts with HCC with disease progression during or following 1st-line therapy with SOR (or who were intolerant to SOR) are randomized 1:1 to receive RAM (8 mg/kg) or PBO once every 2 weeks, with BSC, until disease progression or intolerable toxicity. Eligibility includes prior SOR as 1st-line systemic treatment for HCC, Child-Pugh A, B7 or 8 cirrhosis, ECOG PS 0-1, bilirubin < 3 mg/dL, transaminases ≤ 5 × upper limit of normal (ULN), creatinine ≤ 1.2 × ULN, and platelets ≥ 75×103/µL. The primary endpoint is OS. Secondary endpoints include PFS, best objective response rate, TTP, patient-reported outcome measures of disease-specific symptoms and health-related quality of life, safety, and RAM pharmacokinetics, pharmacodynamics, and immunogenicity. With 544 patients, this study is designed to detect an increase in OS (median 6 m with PBO to 8 m with RAM; 1-sided α= 2.5%, 85% power). As of 18 January 2012, approximately 52% of planned pts have been randomized. The IDMC reviewed this study on 21 June and 3 November 2011 and recommended the study to continue unmodified.
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