[Efficiency and good tolerance of rituximab for idiopathic thrombocytopenic purpura revealing a 22q11 deletion syndrome]. / Efficacité et bonne tolérance du rituximab sur un purpura thrombopénique immunologique chronique révélant un syndrome de délétion 22q11.

INTRODUCTION: 22q11 deletion is a common genetic disorder which associates a polymalformative syndrome to dysimmune features. Autoimmunity and immune deficiency manifestations are often associated, resulting in a therapeutic challenge for this disease. CASE REPORT: We report a 28-year-old patient who presented with hemorrhagic manifestations leading to the diagnosis of severe thrombocytopenia (15,000/mm3), of both central and peripheral origin. Patient history, cardio-facial malformative syndrome, hypoparathyroidism and partial immune deficiency led to the molecular diagnosis of 22q11 deletion syndrome. After failure of polyvalent immunoglobulin infusions, rituximab alone allowed the increase of platelets to their usual level of 100-120,000/mm3 within 4 weeks and a complete clinical remission of the hemorrhagic syndrome, without any infectious complication after a 4-year follow-up. CONCLUSION: Rituximab may be an alternative to corticosteroid for the treatment of auto-immune manifestations associated with minor forms of 22q11 deletion syndrome without significant worsening of the immune deficiency.