title: Effects of gonadotropin-releasing hormone agonists on bone metabolism markers and bone mineral density in patients with prostate cancer.
abstract: OBJECTIVE
  To better understand bone metabolism and predict bone loss in treatment using gonadotropin-releasing hormone agonist for patients with prostate cancer.
  
  
  METHODS
  The changes in bone mineral density and blood levels of bone metabolism markers and the level of pyridinoline cross-linked carboxy-terminal telopeptide of type I collagen, a specific marker of bone resorption, and carboxy-terminal pro-peptide of human type I procollagen, a specific marker of bone formation, were examined in 27 consecutive patients with prostate cancer without bone metastasis.
  
  
  RESULTS
  After 2 years of gonadotropin-releasing hormone treatment, the bone mineral density was significantly lower (median 0.937 g/cm2) than before treatment. Pyridinoline cross-linked carboxy-terminal telopeptide of type I collagen began to increase significantly 6 months after the start of treatment (3.0 to 8.3 ng/mL, median 4.6, at baseline versus 3.4 to 8.2 ng/mL, median 5.2, after 6 months). Carboxy-terminal pro-peptide of human type I procollagen began to show a significant rise 1 year after the start of treatment (from 72.8 to 221.5 ng/mL, median 102.0, at baseline to 82.7 to 293.4 ng/mL, median 132.0, at 1 year).
  
  
  CONCLUSIONS
  Functional coupling between bone resorption and formation was noted, and a decrease in bone mass, even in men, owing to androgen deficiency, was biochemically demonstrated. Fluctuations in these two bone metabolism markers preceded the decrease of bone mineral density. Therefore, these markers might be a predictor of bone loss.
authors.affiliation: Department of Urology, Okayama University Medical School, Okayama, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Miyaji
authors.forename: Takashi
authors.initials: T
authors.lastname: Saika
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kusaka
authors.forename: Ryoji
authors.initials: R
authors.lastname: Arata
authors.forename: Shin
authors.initials: S
authors.lastname: Ebara
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Nasu
authors.forename: Tomoyasu
authors.initials: T
authors.lastname: Tsushima
authors.forename: Hiromi
authors.initials: H
authors.lastname: Kumon
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy* / Q000378:metabolism; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers; D015519:Bone Density / Q000187:drug effects*; D016723:Bone Remodeling / Q000187:drug effects; D001862:Bone Resorption / Q000139:chemically induced; D001842:Bone and Bones / Q000187:drug effects* / Q000378:metabolism; D024042:Collagen Type I; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists*; D017273:Goserelin / Q000009:adverse effects / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D016729:Leuprolide / Q000009:adverse effects / Q000494:pharmacology* / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D010024:Osteoporosis / Q000139:chemically induced; D010446:Peptide Fragments / Q000097:blood; D010455:Peptides; D011347:Procollagen / Q000097:blood; D011471:Prostatic Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D013739:Testosterone / Q000097:blood
chemical_list: D015415:Biomarkers; D024042:Collagen Type I; D010446:Peptide Fragments; D010455:Peptides; D011347:Procollagen; C052929:collagen type I trimeric cross-linked peptide; C042813:procollagen type I carboxy terminal peptide; D017273:Goserelin; D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; D016729:Leuprolide