Supplementary Material for: Neonatal outcomes following two cases of maternal CAR-T therapy for high grade B-cell lymphoma

Introduction: Chimeric antigen receptor T-cells (CAR-T) targeting CD19 represent a significant advance in treatment for patients with relapsed/refractory B-cell malignancies. Although a significant minority of recipients are women during their reproductive years, there is a paucity of data regarding pregnancy and neonatal outcomes in women previously treated with CAR-T. This is important as maternal T-cells are known to cross the placenta and into breastmilk during pregnancy and breastfeeding, respectively. Case presentation: Here we present two successful pregnancies following CAR-T therapy where both neonates were initially breastfed. These represent the first cases of neonates born following CAR-T therapy comprehensively described in medical literature. Conclusion: Pregnancy following CAR-T therapy does not appear to be associated with adverse neonatal outcomes. Further work is required to delineate the outcomes in this population.