RecruitingPhase 2Drug trialA Study of the Safety and Activity of Sparsentan for the Treatment of Patients With Immunoglobulin A NephropathyTo determine the nephroprotective potential of treatment with sparsentan in (1: Cohort A) patients newly-diagnosed with immunoglobulin A nephropathy (IgAN) (ie, incident patients) who have not received prior angiotensin-converting enzyme inhibitor (ACEI) or angiotensin receptor blocker (ARB) therapy, and in (2: Cohort B) patients with recurrent IgAN following kidney transplantation.