P1.01-133 Randomized Open-Label Study of Bintrafusp Alfa (M7824) vs Pembrolizumab in Patients with PD-L1 Expressing Advanced 1L NSCLC

Transforming growth factor β (TGF- β) promotes tumor progression via immune- and non–immune-related processes. Bintrafusp alfa* (M7824) is an innovative first-in-class bifunctional fusion protein composed of 2 extracellular domains of TGF-βRII (a TGF-β "trap") fused to a human IgG1 monoclonal antibody against PD-L1. Targeting these independent and complementary pathways may restore and enhance antitumor responses. An expansion cohort of the NCT02517398 study of patients with advanced NSCLC (n=80) treated with bintrafusp alfa in the second-line setting presented at ESMO 2018 showed an objective response rate of 86% in the subgroup with high PD-L1 tumor expression at the recommended phase 2 dose (1200 mg intravenously [IV] every 2 weeks [Q2W]). Observed data support the hypothesis that bintrafusp alfa may be superior to other PD-(L)1 inhibitors, including pembrolizumab, for the treatment of NSCLC. Based on the promising antitumor activity and manageable safety profile, this study will evaluate bintrafusp alfa treatment in patients with advanced NSCLC in the 1L setting. Here we present a global, randomized trial comparing bintrafusp alfa vs pembrolizumab in the 1L treatment of patients with metastatic NSCLC with high PD-L1 expression levels. Patients in this study must have a histologically confirmed diagnosis of advanced NSCLC with high PD-L1 expression on tumor cells (defined as either ≥80% by the Dako 73-10 pharmDx kit or ≥50% by the Dako 22C3 pharmDx kit since both assays are expected to select a similar patient population at their respective cut-offs). ECOG performance status must be 0 or 1. Patients must not have received prior systemic treatment for advanced NSCLC. Patients with tumors with actionable mutations (for which targeted therapy is locally approved) are not eligible. Patients will receive 1200 mg Q2W or pembrolizumab 200 mg Q3W as an IV infusion until confirmed disease progression, unacceptable toxicity, or trial withdrawal. Dual primary endpoints are progression-free survival and best overall response; key secondary endpoints include overall survival, duration of response, and safety. Estimated enrollment is 300 patients. Clinical trial information: NCT03631706. *Proposed INN. © 2019 American Society of Clinical Oncology, Inc. Reused with permission. This abstract was accepted and previously presented at the 2019 ASCO-SITC Clinical Immuno-Oncology Meeting. All rights reserved. Section not applicable Section not applicable