PHOENIX was a Phase 2, open-label, multi-center, US-only trial of bardoxolone methyl in four separate cohorts of patients with autosomal dominant polycystic kidney disease, IgA nephropathy, type 1 diabetic chronic kidney disease, or focal segmental glomerulosclerosis. The trial enrolled 28 patients with type 1 diabetic chronic kidney disease and the primary endpoint was change in estimated glomerular filtration rate at Week 12.