We observed the following complications: 3 with vasculitis, 1 with anti-MAG neuropathy with cryoglobulin, 1 with sarcoidosis, 1 with acute polyarthritis, 1 with rheumatoid arthritis, 1 with immune thrombocytopenia, and 1 with glomerulopathy with IgA mesangial deposits. The gene discussed is CD79A; the disease is sarcoidosis.