Study Design. The experimental design is a multi-center, prospective, controlled, open label randomized trial comparing two treatment regimens, CSA vs. MMF/Pulse Steroids. The treatment regimens in both arms also include angiotensin converting enzyme inhibitor (ACEI) therapy and alternate day low dose prednisone. The CSA and MMF/Pulse steroid treatment regimens will be implemented over the first 26 weeks after randomization and continued to 52 weeks if a response in proteinuria occurs. The ACE inhibitor component continues for an additional 26 weeks after withdrawal of initial therapies.