The serum autoantibody target profile at tumor recurrence (detailed below), 6 months after stopping CAR T-cell infusions (day 546), was noted to be distinct from that at remission (day 425; Fig. 6c and Supplementary Data 1), with a corresponding increase in the child’s serum IgG and IgM levels detected using indirect ELISA (Supplementary Fig. 6b). The gene discussed is CD40LG; the disease is neoplasm.