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Changes in serum YKL-40 levels in patients with decreased AAV activity. In 12 patients with serial YKL-40 measurement, serum YKL-40 levels were significantly reduced with decreased BVAS at follow-up. Paired t-test was done to evaluate the changes of serum YKL-40 levels. AAV, ANCA-associated vasculitis; ANCA, Anti-neutrophil cytoplasmic antibody; BVAS, Birmingham vasculitis activity score
