Rituximab for the maintenance of minimal change nephropathy - A report of two pregnancies.

Rituximab targets the CD20 antigen expressed on B-lymphocytes and is used to treat recurrent minimal change disease, but experience of its use in pregnancy is limited. We describe a 28-year-old Caucasian female, with recurrent nephrotic syndrome secondary to minimal change disease. She had failed to respond to non-teratogenic alternative therapies. The patient was successfully maintained in remission with rituximab during two consecutive pregnancies. Rituximab (1 g) was administered at 14+6 weeks 14 weeks and 6 days during Pregnancy 1 and 500 mg administered at 23+4 weeks 23 weeks and 4 days of Pregnancy 2. Rituximab had no apparent effect on infant B-cell development in either pregnancy, as neonatal lymphocyte titres were within normal range. There were no maternal complications in either pregnancy. Neither infant encountered infection-related complications. Although rituximab administration during pregnancy appeared safe, evidence of placental transfer is reported with neonatal B-cell depletion, thus alternatives with known safety profiles in pregnancy should be considered before rituximab administration.