The purpose of this study is to evaluate the efficacy, safety and drug levels of CC-97540 in participants with active systemic lupus erythematosus (SLE) including lupus nephritis with inadequate response to glucocorticoids and at least 2 immunosuppressants.

This is an open-label Phase 2 study evaluating the long term safety and tolerability of GFB-887 in patients with focal segmental glomerulosclerosis (FSGS), and treatment-resistant minimal change disease (TR-MCD)