IL6 and congenital rubella syndrome: In a 24-month clinical update of the JULIET study, increased serum C-reactive protein, ferritin, interferon-ɤ, interleukin (IL)-2, IL-6, and IL-10 levels after tisa-cel infusion were associated with severe CRS, with an increase as early as 2 days after infusion for IL-2, IL-6, and interferon-ɤ.