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Efficacy of simultaneous determination of bone alkaline phosphatase mass concentration in serum and urinary excretion of pyridinium cross-links for detection of bone metastases.

Abstract：

OBJECTIVES:To examine the diagnostic validity of bone alkaline phosphatase (BAP) in serum (a marker of bone formation) and of urinary excretion of pyridinium cross-links (PYR) (a marker of bone resorption) for detection of bone metastases. DESIGN AND METHODS:Two heterogeneous immunoassays were employed for determination of BAP mass concentrations (Tandem-R Ostase) in serum and the urinary excretion of PYR (Collagen Crosslinks) in a consecutive series of 89 tumor patients examined by bone scintigraphy (with 99mTc-methylene diphosphonate). RESULTS:The discrimination power (as determined by Z score analysis) and the accuracy (as assessed by the area under the receiver-operating characteristic curve) was higher for BAP (0.84) than for PYR (0.76). Combination of both markers yielded a further increase of accuracy (0.89). There was a correlation (r = +0.422; p < 0.001) between the urinary excretion of pyridinium cross-links and bone alkaline phosphatase mass concentrations in the whole of 89 patients examined. In 14 (16%) of 89 patients bone alkaline phosphatase values were within the reference interval in spite of total alkaline phosphatase activity being increased; this indicates a higher diagnostic specificity of bone alkaline phosphatase (compared with total alkaline phosphatase) with respect to detection of bone metastases. CONCLUSION:Simultaneous assessment of bone formation by BAP and of bone resorption by PYR provides a suitable tool for detection of bone metastases.

journal_name

Clin Biochem

journal_title

Clinical biochemistry

authors

Withold W,Georgescu G,Khakzad H,Vosberg H,Mueller-Gaertner HW,Reinauer H

doi

10.1016/0009-9120(95)96621-a

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

511-9

issue

5

eissn

0009-9120

issn

1873-2933

pii

0009-9120(95)96621-A

journal_volume

28

pub_type

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