Supplementary Material for: Corticosteroid for IgA Nephropathy: Are They Really Therapeutic?

<b><i>Background:</i></b> IgA nephropathy (IgAN) is a common chronic glomerular disease that, in most patients, slowly progresses to end-stage kidney disease. The therapy with corticosteroid in IgAN is still a worldwide problem that is confusing the clinicians. <b><i>Methods:</i></b> MEDLINE, EMBASE, the Cochrane Library, and article reference lists were searched for randomized controlled trials (RCTs) that compared corticosteroids with placebo and any other non-immunosuppressive agents in treating IgAN. Twelve RCTs involving 1,057 patients were included. <b><i>Results:</i></b> Overall, we found that steroids had statistically significant effects in preventing the decline in renal function (relative risk 0.42, 95% CI 0.25–0.71, <i>p</i> < 0.001) and reducing proteinuria (SMD: –0.58 g/day, 95% CI –0.80 to –0.36 g/day) in patients with IgAN. The association between glucocorticoid and risk of kidney outcome was not modified by steroids’ type (prednisone or methylprednisone), dose (≤30 or > 30 mg/day), duration (≤8 or > 8 months), or serum creatinine (< 1.10 or ≥1.10 mg/dL). But steroids increased the risk of side effects such as gastrointestinal and endocrinium symptoms. <b><i>Conclusion:</i></b> This study provides the clear beneficial effects of the steroids therapy on the kidney function and proteinuria, although it should be used with caution.