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Kaplan–Meier survival plots of independent risk factors for PFS in ES-SCLC patients. (A) N stage; (B) Thoracic radiotherapy; (C) Post-AAPR.
Abbreviations: PFS, progression-free survival; ES-SCLC, extensive-stage small-cell lung cancer; AAPR, albumin-to-alkaline phosphatase ratio.
