FTH1 and adult-onset Still disease: After stimulation of PBMCs with LPO inducers, erastin or RSL3, the FTH levels on the erastin-treated or RSL3-treated PBMCs from AOSD patients (mean of fold change, 2.47 and 1.61, respectively) were significantly higher than those from HC subjects (0.84, p < 0.05, and 0.74, p < 0.01, respectively, Figure 2B).