ATF4 and lymphoma: In DAUDI and CA-46 lymphoma cells, artesunate triggered ferroptosis and ER stress through the activation of ATF4 (activating transcription factor-4)-CHOP (C/EBP [CCAAT-enhancer-binding protein] homologous protein)-CHAC1 (glutathione-specific γ-glutamylcyclotransferase 1) pathway and PERK [protein kinase RNA (PKR)-like ER kinase] branch of UPR [31] (Table 1).