Stills Dz Rx w/ IL-1 or IL-6 inhib may mask Dx of MAS! Study of 162 systemic JIA & MAS (62 on biologics). Biologic Rx pts had lower Plt, Ferritin (1107 vs 2863(, CRP (15 vs 90), ESR, fever duration. 27% on IL1/IL6i did not meetMAS classification criteria https://t.co/RmAzxh459R https://t.co/SXroqNBLSZ