MIF and nasopharyngeal carcinoma: We found that the MIF level of NPC cell lines was significantly higher than that of the normal nasal mucosal cell line NP69 and M0, M1, and M2 macrophages (Figures 5D,E), and GPX4 (glutathione peroxidase 4) expression was positively correlated with MIF (Figures 5D,F).