Based on these findings, a diagnosis of membranous nephropathy was made, and the patient was initiated on immunosuppressive therapy with prednisolone. After two months of therapy, proteinuria persisted despite treatment with sacubitril/valsartan, an SGLT2 inhibitor, and corticosteroid, and it was planned to initiate rituximab therapy for the treatment of steroid-nonresponsive membranous nephropathy. The gene discussed is SLC5A2; the disease is membranous glomerulonephritis.