Exploring Prognostic Factors and Survival Outcomes in Advanced Non-Small Cell Lung Cancer Patients Undergoing First-Line Chemotherapy in Limited-Resource Settings.

: Non-small cell lung cancer (NSCLC) remains a leading cause of cancer-related mortality globally, especially in limited-resource countries (LRCs) where access to advanced treatments such as targeted therapy and immunotherapy is constrained. Platinum-based chemotherapy remains a cornerstone of first-line therapy. This study aims to identify prognostic factors influencing survival outcomes and evaluate treatment response to chemotherapy in advanced NSCLC patients in LRCs. : A retrospective cohort study was conducted on 200 advanced NSCLC patients treated with first-line platinum-based doublet chemotherapy at Surin Hospital Cancer Center, Thailand. Prognostic factors were assessed through univariate and multivariate Cox regression analyses. Additionally, restricted mean survival time (RMST) was calculated to compare survival outcomes between responders and non-responders. : Independent prognostic factors associated with improved survival included good performance status, ECOG 0-1 (HR 0.50, = 0.012), serum albumin ≥ 3.5 mg/dL (HR 0.60, = 0.010), and favorable response to chemotherapy (HR 0.57, = 0.003). Responders demonstrated significantly longer RMST at 12 months ( < 0.001), 24 months ( < 0.001), and 36 months ( = 0.004) compared to non-responders. : Identifying prognostic factors and treatment responses is important for improving outcomes in advanced NSCLC patients, particularly in limited-resource settings where access to novel therapies is restricted.