Retrospective Analysis of a Longitudinal Single Institution 219 Common Variable Immunodeficiency Patient Cohort

Abstract Common variable immunodeficiency is a heterogenous disorder of the immune system associated with immunodeficiency, lymphoproliferation, autoimmunity, and malignancy. Certain laboratory characteristics of common variable immunodeficiency patients can be associated with an increase of related clinical sequelae, though there is limited data on predictive characteristics for clinical sequelae in CVID patients. The purpose of this study was to analyze a unique large CVID patient cohort for predictive laboratory characteristics of clinical sequelae. A retrospective chart review was performed of a longitudinal cohort of CVID patients treated at a single institution, largely by a single provider with higher dose replacement immunoglobulin, that has not been previously described. 219 CVID patients were followed for 1,990 patient-years. 86% of the patients were on immunoglobulin with an average IgG trough of 1260 mg/dL. Low IgG at time of diagnosis, low CD19 absolute cell count, and poor mitogen induced lymphocyte proliferation were associated with increase of CVID clinical sequelae. In particular, this cohort demonstrates the novel finding that low IgG at time of diagnosis prior to immunoglobulin replacement is associated with a higher incidence of lymphoma, bronchiectasis, granulomatous disease, lymphoid hyperplasia, splenomegaly, and hepatic disease.