title: Increased type I collagen degradation in early rheumatoid arthritis.
abstract: OBJECTIVE
  To evaluate the serum concentration of the mature, crosslinked carboxy terminal telopeptide of type I collagen (ICTP) in patients with early onset rheumatoid arthritis (RA) and to assess its correlation with clinically relevant features of the disease.
  
  
  METHODS
  The serum ICTP concentration was measured in 99 adult patients with RA with a duration of disease less than one year. The main clinical outcome measures were joint count, modified Lansbury index, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), Larsen index and number of erosions in peripheral joints.
  
  
  RESULTS
  There was a strong positive correlation (p < 0.001) between the serum ICTP concentration and the Lansbury joint index and a weaker but still significant correlation (p < 0.01) between the serum ICTP concentration and the number of eroded hand and foot joints.
  
  
  CONCLUSIONS
  Serum ICTP may have value as a marker of tissue destruction in patients with early RA.
authors.affiliation: Rheumatism Foundation Hospital, Heinola, Finland.
authors.forename: A
authors.initials: A
authors.lastname: Kotaniemi
authors.forename: H
authors.initials: H
authors.lastname: Isomäki
authors.forename: M
authors.initials: M
authors.lastname: Hakala
authors.forename: L
authors.initials: L
authors.lastname: Risteli
authors.forename: J
authors.initials: J
authors.lastname: Risteli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000097:blood* / Q000000981:diagnostic imaging / Q000473:pathology; D015415:Biomarkers; D003094:Collagen / Q000097:blood*; D024042:Collagen Type I; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010455:Peptides / Q000097:blood*; D011859:Radiography
chemical_list: D015415:Biomarkers; D024042:Collagen Type I; D010455:Peptides; C052929:collagen type I trimeric cross-linked peptide; D003094:Collagen