Abstract
B-cell expansion with NF-κB (nuclear factor-kappa B) and T-cell anergy (BENTA) is a rare congenital lymphoproliferative disorder caused by germline gain-of-function mutations in the CARD11 gene. We herein report a familial case of BENTA due to a G123D heterozygous missense mutation in CARD11 inherited by a male from his mother. The mother's clinical course was characterized by polyarthritis and encephalitis in young adulthood, suggesting that autoimmune-like manifestations can occur in BENTA. The B-cell lymphocytosis and splenomegaly seen in her child have been managed with prednisolone and tacrolimus. Further investigations are needed to evaluate the efficacy of calcineurin inhibitors for BENTA.
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