Numbers of patients with enhanced granular expression of IgG4 among thrombospondin type-1 domain-containing 7A (THSD7A)-positive, M-type phospholipase A2 receptor (PLA2R)-positive, and THSD7A/PLA2R-negative patients with idiopathic MN and secondary membranous nephropathy (MN). The gene discussed is PLA2R1; the disease is membranous glomerulonephritis.