IMDYLLTRA® (tarlatamab) received UK MHRA conditional marketing authorisation for treating adult ES-SCLC patients post two prior therapies, including platinum-based chemotherapy. In a Phase 2 study, it showed a 41% objective response rate and 9.7-month median duration of response. SCLC, accounting for 15% of lung cancers, is aggressive with poor survival rates. Tarlatamab, a bispecific T-cell engager, targets DLL3 on tumor cells and CD3 on T cells, inducing tumor cell lysis. Common side effects include cytokine release syndrome and pyrexia.