CONTRADICTING EVIDENCE: We investigated zenocutuzumab (Zeno, MCLA-128), an ADCC-enhanced anti-HER2xHER3 bispecific antibody, in NRG1 fusion-positive...A CD74-NRG1-positive NSCLC patient who had progressed on six prior lines of systemic therapy including afatinib responded rapidly to treatment with a partial response. Targeting HER2 and HER3 simultaneously with Zeno is a novel therapeutic paradigm for patients with NRG1 fusion-positive cancers.