PTPRC and anti-neutrophil cytoplasmic antibody-associated vasculitis: In parallel, the frequency of IgD-CD27hiCD38hi B cells among CD45+ leukocytes was significantly higher in AAV patients in active stage than those in AAV patients in remission and healthy controls (median 1.33‰ [IQR 1.03–2.40‰] vs. median 0.74‰ [IQR 0.52–1.21‰], p = 0.002; median 1.33‰ [IQR 1.03–2.40‰] vs. median 0.53‰ [IQR 0.34–0.88‰], p = 0.001, respectively).