STAT1 and adult-onset Still disease: Besides, serum samples from AOSD patients P3-P5, who had low-titer autoAbs but no OIs, showed a greater capacity to block STAT1 phosphorylation (76.9 ± 6.36%) compared with those from the autoAbs-negative AOSD group (104.9 ± 18.63%, p = 0.0518).