IL6 and congenital rubella syndrome: On day +6 following treatment with GD2-CAR T cells intravenously (i.v.), she experienced grade 1 cytokine release syndrome (CRS; 40.1 °C fever) together with worsening cranial nerve symptoms consistent with TIAN and was treated with tocilizumab (an IL-6 antagonist) and corticosteroids (Supplementary Table 3).