Patients with IgA nephropathy had higher serum IgA levels (median, 369.0; IQR, 278.0–469.5 mg/dL), whereas patients with MCD had higher serum IgM (median, 121.0; IQR 82.4–173.5 mg/dL) levels. This evidence concerns the gene CD79A and IgA glomerulonephritis.