title: Renal histology in Chinese patients with anti-myeloperoxidase autoantibody-positive Wegener's granulomatosis.
abstract: BACKGROUND
  Proteinase-3 antineutrophil cytoplasmic antibody (PR3-ANCA) was the serological marker for Wegener's granulomatosis (WG), while myeloperoxidase (MPO)-ANCA was the serological marker for microscopic polyangiitis (MPA). However, our previous study suggested that patients with MPO-ANCA positive WG were common in Chinese. This study aimed to analyse the renal histology of patients with MPO-ANCA positive WG.
  
  
  METHODS
  Patients in our centre with WG were selected according to both the Chapel Hill Consensus Conference (CHCC) definition and American College of Rheumatology classification criteria. Patients with MPA were selected according to the CHCC definition. The renal histology was compared between patients with MPO-ANCA positive WG and with PR3-ANCA positive WG as well as patients with MPO-ANCA positive MPA.
  
  
  RESULTS
  Sixty-one patients with WG had complete renal histological data, 39/61 with positive MPO-ANCA and 22/61 with positive PR3-ANCA. Among patients with crescents in glomeruli, those with MPO-ANCA had fewer cellular crescents and more fibrous crescents than those with PR3-ANCA (P < 0.01 and P < 0.05, respectively). Interstitial fibrosis and tubular atrophy were more prevalent and severe in patients with MPO-ANCA than in those with PR3-ANCA (P < 0.01 and P < 0.05, respectively). Compared with 44 patients with MPO-ANCA positive MPA, patients with MPO-ANCA positive WG had fewer glomeruli with crescents and more normal glomeruli (P < 0.01 and P < 0.01, respectively).
  
  
  CONCLUSIONS
  Patients with MPO-ANCA positive WG are common in Chinese. In renal histology, chronic lesions were more severe and prevalent in patients with MPO-ANCA positive WG than in patients with PR3-ANCA positive WG. Glomerular lesions were less severe and less prevalent in patients with MPO-ANCA positive WG than in those with MPO-ANCA positive MPA.
authors.affiliation: Renal Division and Institute of Nephrology, Peking University First Hospital, Beijing 100034, PR China.
authors.forename: Min
authors.initials: M
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Yu
authors.forename: Su-Xia
authors.initials: SX
authors.lastname: Wang
authors.forename: Wan-Zhong
authors.initials: WZ
authors.lastname: Zou
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Zhao
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019268:Antibodies, Antineutrophil Cytoplasmic / Q000737:chemistry; D002681:China; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect; D014890:Granulomatosis with Polyangiitis / Q000276:immunology* / Q000473:pathology*; D006801:Humans; D007668:Kidney / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D053146:Myeloblastin / Q000737:chemistry; D009195:Peroxidase / Q000737:chemistry* / Q000276:immunology*
chemical_list: D019268:Antibodies, Antineutrophil Cytoplasmic; D009195:Peroxidase; D053146:Myeloblastin