CD79A and immunodeficiency disease: The patient cohort comprised several PIDs: 18 patients (64.3%) had a common variable immunodeficiency disorder (CVID), 6 patients (21.4%) had a combined immunodeficiency (CID), 3 patients (10.7%) an IgA with IgG subclass deficiency, and 1 patient (3.6%) an isolated IgG subclass deficiency.