Hazard ratios for overall survival (a) and progression-free survival (b) by antibiotic days of therapy (DOT). Each control refers to the patients who have not used antibiotics (NoABX). Anti-tuberculosis medications, beta-lactamase inhibitors, carbapenem (meropenem), second-generation cephalosporins, fourth-generation cephalosporin (cefepime), glycopeptides, imidazole (metronidazole), macrolides, sulfamethoxazole/trimethoprim and tetracycline (doxycycline) were not included in this forest plot due to small sample sizes (<5). Abbreviations: No., number; PD, progression of disease.