CASE REPORTS
JOURNAL ARTICLE
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Activated phosphoinositide 3-kinase δ syndrome presenting with gut-associated T-cell lymphoproliferative disease.

A 13-year-old boy was admitted to our hospital because of persistent diarrhea, abdominal pain, and bloody stools. The patient had experienced repeated hospitalizations for the treatment of respiratory infections since early childhood. Colonoscopic and pathological studies led to a diagnosis of gut-associated T-cell lymphoproliferative disease (T-cell LPD). Laboratory data showed T-lymphocytopenia (492/µl), increased serum IgG levels (1,984 mg/dl), and low serum antibody titers for specific pathogens. Combined immunodeficiency accompanied by T-LPD suggested the diagnosis of activated PI3Kδ syndrome (APDS). Genetic analyses identified a heterozygous mutation of the PIK3CD gene (c.1573 G to A p.Glu525Lys). Although prednisolone and cyclosporine therapy has controlled the T-cell LPD, this patient awaits allogeneic hematopoietic cell transplantation to achieve a complete cure of his APDS.

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