Such important biomarkers include anti-PLA2R [26] and anti-THSD7A antibodies [27], which are specific to the primary form, as well as exostosin (EXT-1 and EXT-2), as markers of membranous nephropathy secondary to autoimmune diseases, particularly LN [28]. The gene discussed is THSD7A; the disease is membranous glomerulonephritis.