In this study, EASIX, modified EASIX (mEASIX; LDH [units per liter] X C-reactive protein [milligrams per deciliter]/PLTs [×109 per liter]), and simplified EASIX (sEASIX; LDH [units per liter]/PLTs [×109 per liter]) were calculated before CAR-T cell infusion (start of LD and day −1), and early post-CAR-T cell infusion (day +1 and +3), including the day of onset of CRS. The gene discussed is CRP; the disease is congenital rubella syndrome.