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Additional file 1: Table S1. Microbiological tests and biomarkers recorded in the study, and the proportion of ARDS patients receiving these tests. Table S2. Distribution of missing data for PaO2/FiO2 ratios and SOFA (Sequential Organ Failure Assessment) scores at different time points. Table S3. Microbiological tests for 62 cases of acute respiratory distress syndrome with unknown etiologies. Table S4. Species distribution of bacteria in 87 cases of bacterial pneumonia associated ARDS. Table S5. Etiologies of ARDS in patients with lung cancer and other cancer types. Table S6. Characteristics of patients with and without cancer in 258 patients with ARDS. Table S7. Causes of hypoxemia stratified by cancer in 294 non-ARDS patients with PaO2/FiO2 ratios ≤ 300 mmHg.