Obinutuzumab Beta Combined With Low-dose Glucocorticoid in New-onset ANCA-Associated Glomerulonephritis

Inclusion Criteria: * New diagnosis of ANCA-associated vasculitis (Granulomatosis with polyangiitis \[GPA\] or Microscopic polyangiitis \[MPA\]) according to the Chapel Hill Consensus Conference definitions. * Positive for PR3-ANCA or MPO-ANCA. * Active renal involvement indicated by recent renal biopsy (pauci-immune necrotizing and/or crescentic glomerulonephritis) OR active urine sediment characterized by glomerular hematuria and proteinuria. * Provided signed informed consent. Exclusion Criteria: * Prior treatment with targeted B-cell therapies (e.g., Rituximab) or standard cyclophosphamide, azathioprine, or mycophenolate mofetil for AAV. * Current requirement for dialysis, or history of dialysis. * Presence of life-threatening acute vasculitis manifestations other than renal involvement (e.g., diffuse alveolar hemorrhage, respiratory failure, bowel perforation, cerebral vasculitis). * History of malignancy within the past 5 years. * Coexisting multisystem autoimmune diseases (e.g., systemic lupus erythematosus, anti-GBM disease). * Active severe infections, active tuberculosis, or chronic viral infections (HBV with positive HBsAg or HBV-DNA, active HCV, HIV). * Pregnant or lactating women.