title: Correlation between serum C-terminal cross-linking telopeptide of type I collagen and staging of oral bisphosphonate-related osteonecrosis of the jaws.
abstract: OBJECTIVE
  The aim of the present study was to correlate the staging of bisphosphonate-related osteonecrosis of the jaws (BRONJ) with serum C-terminal cross-linking telopeptide of type I collagen (CTX), which is under debate as an index of risk prediction. Stage I BRONJ was defined as asymptomatic osteonecrotic bone. Stage II BRONJ includes infection, and stage III includes additional complications such as fracture or extraoral fistulas.
  
  
  METHODS
  The serum CTX values of 18 patients (mean age 74 years) who were diagnosed with osteonecrosis of the jaws caused by oral bisphosphonate were investigated.
  
  
  RESULTS
  The serum CTX values ranged from 10 to 262 pg/mL (mean 112 +/- 76.1). The mean duration of bisphosphonate therapy was 3.9 years, and 17 of the 18 patients had received once weekly 70 mg aldendronate and 1 patient once weekly 35 mg risedronate. The risk assessment was rated according to the CTX values of the individual patient (minimal risk, more than 150 pg/mL; moderate, 100 to 150 pg/mL; and high, less than 100 pg/mL). Next, the BRONJ scores were calculated according to the number of the BRONJ lesions and their stage. The risk assessment and BRONJ scores were correlated. The result was statistically significant (P = .019).
  
  
  CONCLUSIONS
  BRONJ is relatively rare but has been increasingly recognized in our clinic. The usefulness of the serum CTX value as an index of risk prediction continues to be debated. Considering the staging of lesions and the number of lesions, we found a significant correlation between the disease severity and the risk assessment using serum CTX.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kyung Hee University Medical Center, Seoul, Korea. yongdae.kwon@gmail.com
authors.forename: Yong-Dae
authors.initials: YD
authors.lastname: Kwon
authors.forename: Deog-Yoon
authors.initials: DY
authors.lastname: Kim
authors.forename: Joo-Young
authors.initials: JY
authors.lastname: Ohe
authors.forename: Ji-Yeon
authors.initials: JY
authors.lastname: Yoo
authors.forename: Christian
authors.initials: C
authors.lastname: Walter
mesh_terms: D000284:Administration, Oral; D000368:Aged; D000369:Aged, 80 and over; D019386:Alendronate / Q000009:adverse effects; D015415:Biomarkers / Q000097:blood; D050071:Bone Density Conservation Agents / Q000008:administration & dosage / Q000009:adverse effects*; D024042:Collagen Type I; D004164:Diphosphonates / Q000008:administration & dosage / Q000009:adverse effects*; D012968:Etidronic Acid / Q000009:adverse effects / Q000031:analogs & derivatives; D005260:Female; D006801:Humans; D007571:Jaw Diseases / Q000097:blood / Q000139:chemically induced* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010020:Osteonecrosis / Q000097:blood / Q000139:chemically induced* / Q000473:pathology; D010446:Peptide Fragments / Q000097:blood*; D010455:Peptides; D011347:Procollagen / Q000097:blood*; D000068296:Risedronic Acid
chemical_list: D015415:Biomarkers; D050071:Bone Density Conservation Agents; D024042:Collagen Type I; D004164:Diphosphonates; D010446:Peptide Fragments; D010455:Peptides; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; D000068296:Risedronic Acid; D012968:Etidronic Acid; D019386:Alendronate