Clinicopathologic Changes in Children with Immunoglobulin A Nephritis and Henoch-Schönlein Purpura Nephritis after Cyclosporine A and Angiotensin-converting Enzyme Inhibitor Treatment

Purpose: To investigate the clinicopathologic effects of cyclosporine A (CsA) in children with diseases characterized by mesangial immunoglobulin A deposits such as immunoglobulin A nephropathy (IgAN) and Henoch-Schönlein purpura nephritis (HSPN). Methods: We retrospectively reviewed the clinicopathologic outcomes of 54 children (IgAN, 36; HSPN, 18) treated with CsA. The starting dose of CsA was 5 mg/kg per day, and it was administered in 2 divided doses. The degree of proteinuria and pathologic changes in renal biopsies were evaluated before and after CsA treatment. Results: The mean protein to creatinine ratio decreased from 3.7±1.5 to 0.6±0.4 (P