The Pre-cachexia or Cachexia Patients Who Have Not Received Systemic Treatment and Are Not Eligible for Curative Therapy

This study is a prospective, randomized, parallel-controlled clinical trial, aiming to evaluate the efficacy and safety of nano-crystalline megestrol acetate combined with standard treatment compared to standard treatment alone as first-line therapy for extensive-stage small cell lung cancer (ES-SCLC) in both the pre-cachexia and cachexia phases. Participants enrolled in the study are those with ES-SCLC in the pre-cachexia or cachexia phase who have not received systemic treatment and are not eligible for curative therapy.