“ Exemestane induced a significant antioxidant response in NCI‐H2452 cells, as highlighted by an increase in &ggr;‐glutamylcysteine levels, catalase (Cat), superoxide‐dismutase and (SOD) and glutathione‐peroxidase (GSH‐Px) activity and nuclear factor E2‐related factor 2 (Nrf2) activation, responsible for drug insensitivity.”