Sao Paulo Medical Journal
On-line version ISSN 1806-9460
JABLONKA, Fernando et al. Serum cross-linked n-telopeptides of type 1 collagen (NTx) in patients with solid tumors. Sao Paulo Med. J. [online]. 2009, vol.127, n.1, pp.19-22. ISSN 1806-9460. http://dx.doi.org/10.1590/S1516-31802009000100005.
CONTEXT AND OBJECTIVE: Cross-linked N-telopeptides of type I collagen (NTx) increase in concentration in situations in which bone resorption is increased, such as osteoporosis and bone metastasis (BM). We aimed to evaluate the serum concentrations of NTx in a sample of patients with several types of solid tumors. DESIGN AND SETTING: Cross-sectional analytical study with a control group in a tertiary public hospital. METHODS: We performed the quantitative enzyme-linked immunosorbent assay (ELISA) on serum NTx levels in 19 subjects without a history of cancer and 62 patients with various solid tumors who had been referred for a bone scan. Three experienced analysts read all bone scans. RESULTS: The serum NTx levels in patients with cancer and BM, with cancer but without BM and without cancer were 46.77 ± 2.58, 32.85 ± 2.05 and 22.32 ± 2.90 respectively (P < 0.0001). We did not find any significant correlations of serum NTx with age, gender, history of bone pain, tumor type and bone alkaline phosphatase levels. We found a significant correlation between serum NTx and alkaline phosphatase levels (R2 = 0.08; P = 0.022). CONCLUSIONS: Serum NTx levels are significantly higher in patients with solid tumors and bone metastases than they are in patients without bone metastases and in normal controls.
Keywords : Bone neoplasms; Radionuclide imaging; Predictive value of tests; Alkaline phosphatase; Collagen type I.