On April 9, 2026 Boehringer Ingelheim reported a clinical trial collaboration with BioNTech to evaluate a novel immuno‑oncology combination in extensive‑stage small cell lung cancer (ES-SCLC), one of the most aggressive and underserved forms of cancer. Under the agreement, BioNTech will supply pumitamig (BNT327/BMS‑986545), a PD‑L1/VEGF‑A bispecific antibody being jointly developed by BioNTech and Bristol Myers Squibb, and Boehringer Ingelheim will be the regulatory sponsor of the Phase Ib/II study. The aim is to assess safety, tolerability and early clinical activity of obrixtamig (BI 764532), Boehringer Ingelheim’s investigational DLL3/CD3 T‑cell engager, in combination with pumitamig.
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SCLC is the most aggressive subtype of lung cancer and represents around 15–20% of all lung cancer cases. It progresses rapidly, metastasizes early and almost always recurs within a year after initial treatment. While the addition of immune checkpoint inhibitors to chemotherapy has led to improved survival outcomes for patients with extensive-stage disease, most patients progress within months after treatment, and the prognosis remains poor. The collaboration combines two complementary immunotherapeutic mechanisms to explore a potential new path to enhance and sustain antitumor immunity. Obrixtamig redirects T-cells to kill DLL3 expressing tumor cells, while pumitamig aims to restore T-cells’ ability to recognize and destroy tumor cells while cutting off the blood and oxygen supply that feeds the tumor with the intention of preventing it from growing and proliferating.
"By uniting T‑cell redirection against DLL3 with PD-L1 and VEGF pathway modulation, we aim to address two central barriers in SCLC – immune evasion and an immunosuppressive, pro‑angiogenic microenvironment," said Itziar Canamasas, Global Head of Oncology at Boehringer Ingelheim. "We are committed to advancing combinations that could deliver more durable benefit for people living with ES‑SCLC."
Obrixtamig is Boehringer Ingelheim’s investigational bispecific DLL3/CD3 T‑cell engager, designed to direct immune cells to attack DLL3‑expressing cancer cells, a hallmark of small cell lung cancer and other neuroendocrine carcinomas. In the global Phase I first‑line ES‑SCLC study DAREON‑8, in combination with chemotherapy and atezolizumab, obrixtamig achieved a 68% confirmed objective response rate, 89% disease control rate, and a 9‑month progression‑free survival rate of 52%, with a favorable safety profile1. Obrixtamig is being evaluated across multiple global studies and is advancing into a global Phase III trial (DAREON‑Lung‑1, NCT07472517). It has received FDA Fast Track and Orphan Drug Designations, as well as Orphan Drug status from the European Commission for neuroendocrine carcinomas.
Pumitamig is an investigational PD‑L1/VEGF‑A bispecific antibody being jointly developed by BioNTech and Bristol Myers Squibb that combines two complementary, validated mechanisms in one single molecule – immune checkpoint inhibition and anti-angiogenesis. In a global Phase II first‑line ES‑SCLC study in combination with chemotherapy, pumitamig demonstrated a 76.3% confirmed objective response rate, 100% disease control rate, and median progression-free survival of 6.8 months, with a manageable safety profile2. The program has advanced into a global Phase III trial (ROSETTA LUNG‑01, NCT06712355) and received FDA Orphan Drug Designation in 2025 for the treatment of SCLC.
Under the terms of the agreement, BioNTech will supply pumitamig and Boehringer Ingelheim will be the regulatory sponsor of the study. Both companies retain full rights to their respective assets, and the agreement is mutually non-exclusive. The trial will begin dosing patients in the second half of 2026.
(Press release, Boehringer Ingelheim, APR 9, 2026, View Source [SID1234664292])