Common variable immunodeficiency (CVID) is a primary immunological disease with variable severity, ranging from mild forms of infections to chronic progressive complications. The hallmark of this disorder is hypogammaglobulinemia due to an unknown molecular defect in immune regulation. The primary clinical manifestations are recurrent infections that may lead to structural damage of affected organs. Adequate intravenous immunoglobulin (Ig) therapy has dramatically changed the prognosis of this disorder, and the advent of home subcutaneous Ig therapy has further improved the quality of life of these patients. Aberrant T-cell functions predispose to autoimmune, inflammatory and lymphoproliferative complications, as well as malignancies in a variable percentage of CVID patients. Immunosuppressive anti-inflammatory therapies and chemotherapy are used, although always in conjunction with adequate replacement Ig therapy and adjunct antimicrobial prophylaxis. Any organ can be involved and therefore a multidisciplinary approach to the management of this disorder is essential.
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