CXCL10 and macrophage activation syndrome: Conversely, CXCL10 and galectin‐9 levels were more moderately increased at sJIA‐SD diagnosis and rose sharply only in the week before MAS (median galectin‐9 levels from 14,618 pg/mL [IQR 117,010–19,721 pg/mL] at diagnosis to 36,384 pg/mL [IQR 22,126–469,810 pg/mL] at MAS diagnosis [P = 0.041]; median CXCL10 levels from 847 pg/mL [IQR 519–1,430 pg/mL] at diagnosis to 2,986 pg/mL [IQR 1,449–4,833 pg/mL] at MAS diagnosis [P = 0.023]).