Patients with SIgAD had the following diagnoses: one SLE/scleroderma overlap syndrome (IgA between 0 and 5 mg/dl), one SLE associated with autoimmune hepatitis type I (IgA between 0 and 7 mg/dl), one systemic-onset JIA (IgA between 2 and 6 mg/dl), one MCTD (IgA = 5 mg/dl), one oligoarticular JIA (IgA = 4 mg/dl). This evidence concerns the gene CD79A and mixed connective tissue disease.