Cíl studie: U 60 nemocných s karcinomem prsu jsme vyšetřovali sérové hladiny markeru novotvorby kostí, prokolagen typu 1 N-terminální propeptidu (P1NP) a markerů kostní resorpce, β-CrossLaps (β-CTX) a C-Telopeptid kolagenu typu I (ICTP). U 44 nemocných byly přítomny kostní metastázy a byly léčeny bisfosfonáty, 16 nemocných bylo bez přítomnosti metastatického procesu. Cílem studie bylo vyhodnotit senzitivitu a specifi citu vzhledem k přítomnosti kostních metastáz a efektu terapie bisfosfonáty. Metody: Sérové hladiny kostních markerů β-CrossLaps (CTX) a P1NP jsme stanovovali na analyzátoru Elecsys 2010 (Roche), ICTP byl stanovován manuální EIA metodou (Orion – Diagnostica). Nemocným s prokázanými kostními metastázami (n = 44) byla aplikována terapie bisfosfonáty (Zoledronat 4 mg/28 dní). Analýza kostních markerů byla prováděna před zahájením terapie a 14., 28. a 56. den terapie. Výsledky: Nejvyšší validitu vyšetření pro detekci kostních metastáz karcinomu prsu a reakci na terapii jsme prokázali pro ICTP (specifi cita 89,5% a senzitivita 79,5%). Závěr: Z dosažených výsledků se ICTP jeví jako specifi cký marker kostní remodelace a představuje citlivou a snadnou metodu detekce kostních metastáz i monitorování efektu jejich terapie.
Objective: Biochemical markers of bone formation such as procollagen of type 1 N-terminal propeptide (P1NP) and bone resorption such as beta-CrossLaps (β-CTX) and cross linked c-telopeptide of type I collagen (ICTP) are considered possible non-invasive markers of bone metastases. Our objective was to determine validity of bone markers in the detection of bone metastases and in response to bisphosphonate therapy. Methods: We investigated 60 patients with breast carcinoma: 16 without bone metastases and 44 with metastases treated with Zoledronat 4 mg/28 days. Serum concentrations of β-CTX and P1NP were measured using immunoanalyser Elecsys 2010 (Roche) and ICTP by manual competitive immunoassay (Orion Diagnostica). Determinations of bone markers were performed prior to bisphosphonate therapy and after 2 weeks, 1 month and 2 months during therapy. Results: ICTP proved to have the highest diagnostic validity in detection of bone metastases reaching (specifi city 89,5% and sensitivity 79,5%). Conclusion: ICTP is a highly specifi c marker of bone degradation useful in diagnosis of bone metastases and monitoring of therapeutical effect of bisphosphonate.
- MeSH
- Diphosphonates administration & dosage therapeutic use MeSH
- Financing, Organized MeSH
- Humans MeSH
- Metalloendopeptidases diagnostic use MeSH
- Neoplasm Metastasis diagnosis MeSH
- Drug Monitoring MeSH
- Biomarkers, Tumor blood MeSH
- Bone Neoplasms drug therapy secondary MeSH
- Breast Neoplasms complications MeSH
- Bone Resorption diagnosis blood MeSH
- Check Tag
- Humans MeSH
- Female MeSH
PURPOSE: The International Osteoporosis Foundation (IOF) and the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) have proposed procollagen type I N propeptide (PINP) and β isomerized C-terminal telopeptide of type I collagen (β-CTX-I) as reference bone turnover markers (BTMs) for osteoporosis. This report examines the published literature since the 2011 IOF-IFCC position paper in order to determine the clinical potential of the reference BTMs and newer markers for the prediction of fracture risk and monitoring the treatment of osteoporosis. METHODS: Evidence for the relationship between BTMs and subsequent fractures was gathered from prospective studies through literature review of the Medline database from years 2011 to May 2024. The impact of treatment on BTMs was also studied by examining publications in that period. Studies of the accuracy of BTMs in the assessment of bone turnover in the setting of advanced chronic kidney disease were also examined. RESULTS: Increased BTM concentrations are associated with higher fracture risk in postmenopausal women. PINP and β-CTX-I measured in blood are associated with fracture risk but their interaction with other risk factors has not been sufficiently studied limiting their incorporation into fracture risk algorithms. Treatment-induced changes in PINP and β-CTX-I account for a substantial proportion of fracture risk reduction and are useful for improving adherence; they are recommended for inclusion in studies to examine adherence in individual patients. However, total PINP (tPINP) and β-CTX-I may be elevated in CKD due to renal retention. Bone alkaline phosphatase (BALP), intact PINP (iPINP), and tartrate resistant acid phosphatase 5b (TRACP5b) show the most promise in discriminating high and low turnover bone diseases in patients with advanced CKD and for predicting fracture risk, monitoring treatment response, and assessing the risk of treatment-related complications. CONCLUSION: We re-affirm the use of serum/plasma tPINP and plasma β-CTX-I as reference BTMs with appropriate patient preparation and sample handling and measurement by standardized/harmonized assays in clinical studies to accumulate further data, and for monitoring treatment of osteoporosis in the setting of normal renal function in clinical practice. BALP and TRACP5b, measured by standardized assays, are recommended as reference BTMs for CKD-associated osteoporosis and should be included in observational and intervention studies to ascertain their utility for risk-evaluation, treatment initiation, and assessment of treatment response in CKD-associated osteoporosis.
- MeSH
- Biomarkers blood MeSH
- Risk Assessment methods MeSH
- Bone Density Conservation Agents therapeutic use MeSH
- Collagen Type I blood MeSH
- Consensus MeSH
- Humans MeSH
- Osteoporotic Fractures prevention & control etiology MeSH
- Osteoporosis * diagnosis physiopathology drug therapy blood therapy MeSH
- Peptide Fragments blood MeSH
- Peptides blood MeSH
- Procollagen blood MeSH
- Bone Remodeling * physiology MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Consensus Development Conference MeSH
- Review MeSH
