2028TiP Phase I, non-randomised, open-label, multi-centre dose escalation trial of BI 764532 (DLL3/CD3 IgG-like T cell engager [TcE]) + ezabenlimab (anti-PD-1 antibody) in patients (pts) with small cell lung cancer (SCLC) and other neuroendocrine carcinomas (NECs) expressing DLL3