Prognostic biomarkers for extensive-stage small cell lung cancer receiving amrubicin following failure of chemoimmunotherapy: a retrospective cohort study - Kaira, Kyoichi; Imai, Hisao; Hashimoto, Kosuke; Shiono, Ayako; Yamaguchi, Ou; Miura, Yu; Mouri, Atsuto; Kagamu, Hiroshi (Translational Lung Cancer Research, 2025)