A phase Ib/II, open-label study of tivozanib in combination with durvalumab in subjects with untreated advanced hepatocellular carcinoma.

Abstract

e16599 Background: VEGFR TKIs and checkpoint inhibitors are current standards of care in HCC as single agents, however treatment options are limited, and significant unmet need remains. A recent ph3 study combining bevacizumab (VEGF-A Mab) with a PDL1 inhibitor have shown promising improvements in OS demonstrating that a combination of VEGF and PDL1 inhibition can improve patient outcomes over single agent treatment. Tivozanib (T, a potent and selective VEGFR 1, 2 & 3 TKI) and durvlaumab (D, a PD-L1 antibody) have both demonstrated single agent activity in HCC and have been combined safely with other therapies to enhance patient outcomes in other tumor types. It is hypothesized that more complete inhibition of the VEGF pathway by tivozanib compared to bevacizumab combined with PDL1 inhibition may further enhance patient outcomes. The ph1 portion of this study combines T with D to establish the recommended phase 2 dose (RP2D) and provide preliminary safety and efficacy data. Methods: Major eligibility criteria are adults with documented advanced HCC, Child-Pugh Class A, ECOG 0 or 1, creatinine clearance > 40 ml/min. Major exclusion criteria are co-infection with HBV and either HDV or HCV and significant organ dysfunction. Six patients with untreated advanced HCC will be treated with the combination of T 1 mg orally for 21 days followed by 7 days off treatment and D 1500 mg intravenously every 28 days. A DLT is generally defined as the occurrence of any Grade ≥3 immune or non-immune AE in Cycle 1 that is at least possibly related to the investigational regimen other than any grade of vitiligo or alopecia or Grade 3 controllable hypertension. If two or more patients have a DLT then the dose of tivozanib will be reduced to 1 mg every other day without interruption for the second cohort. In the Phase 2 portion of the study an additional 30 patients will be treated at the RP2D. The primary objective is to establish the RP2D and the safety and tolerability for this combination in patients with advanced HCC. Secondary objectives are to assess the objective response rate, progression free survival, and overall survival in this population. Patients will be treated until progression of disease, unacceptable side effects, or death. Outcome measures will be adverse events per CTCAE v.5 and cross-sectional imaging performed every 8 weeks. Results: Phase 1 safety and efficacy findings for this novel combination will be reported at the meeting. Conclusions: Phase 1 safety and efficacy findings for this novel combination will be reported at the meeting. Clinical trial information: NCT03970616 .