 - Active SLE with GN with no other apparent cause, defined by the following: Renal biopsy evidence within 18 months of nephritis using the WHO or International Society of Nephrology ISNRenal Pathology Society RPS classification of SLE with GN Class III or IV; Urine proteincreatinine ratio UPCr 1 or 24 hour urine protein 1g after at least 12 weeks of treatment with mycophenolate mofetil at least 1.5 gramsday or azathioprine at least 100 mg orally per day; Superimposed membranous changes are allowed for those with Class III or Class IV SLE with GN; 