Patients diagnosed with recurrent or progressive extensive-stage small cell lung cancer (ES-SCLC) may benefit from treatment with ifinatamab deruxtecan (I-DXd), a B7-H3–directed antibody–drug conjugate, according to data presented today at the International Association for the Study of Lung Cancer (IASLC) 2025 World Conference on Lung Cancer (WCLC) in Barcelona, Spain.