FGF5 and nasopharyngeal carcinoma: Because of the concentration of FGF5 protein from NFs-derived CM quite low though overexpressing FGF5, which lower than normal CAFs, therefore this FGF5 protein concentration is not enough to suppress ferroptosis, and it is CAFs-derived FGF5, not NFs, that suppresses DDP-induced ferroptosis in NPC cells.