However, in comparison within each smoking group, EGFR-TKI treatment led to more favourable OS and PFS in never smokers (OS: OR, 0·55; 95% CI, 0·42-0·73; PFS: OR, 0·43; 95% CI, 0·33-0·54), compared with former or current smokers (OS: OR, 0·89; 95% CI, 0·80-0·97; PFS: OR, 0·73; 95% CI, 0·62-0·85).
C0037369
Smoking