Crescentic, proliferative IgA nephropathy: clinical and histological response to methylprednisolone and intravenous cyclophosphamide

Background. IgA nephropathy is an immune‐complex glomerulopathy that can result in capillary or extra‐capillary proliferation. Previous attempts to correlate specific histological findings including cellular crescents or endocapillary proliferation, with clinical outcomes, have produced conflicting results. Methods. We conducted a prospective open‐labelled trial of 12 patients with crescentic, proliferative IgA nephropathy and clinically progressive disease and treated them with pulse steroids and intravenous cyclophosphamide. Therapy included pulse solumedrol at 15 mg/kg/day for 3 days, followed by monthly intravenous cyclophosphamide at 0.5 g/m2 body surface area for 6 months. Clinically significant proteinuria (>1.0 g/24 h) was present in all patients, while nephrotic‐range proteinuria (>3.0 g/24 h) was observed in eight of 12 patients. All patients were hypertensive (BP >140/90 mmHg). Results. After 6 months of treatment, the mean serum creatinine was reduced from a maximum of 2.65±0.39 to 1.51±0.10 mg/dl (P