Abstract
We measured serum tartrate-resistant acid phosphatase (TRAP) activity in 120 healthy subjects and 35 patients with multiple myeloma as well as urinary hydroxyproline excretion in the myeloma patients. Young subjects (0-18 years) showed higher TRAP levels (ANOVA p less than 0.01) compared with the other age classes due to the more active bone remodelling processes associated with growth. Myeloma patients with bone lytic lesions (MM+) showed higher serum TRAP values than controls (p less than 0.01). Hydroxyproline excretion was higher in MM+ patients but the difference between patients with and without bone lesions was not statistically significant. Our data suggest that serum TRAP activity may be a suitable, simple biochemical test to assess bone turnover in patients with multiple myeloma but that its clinical usefulness as a marker of bone resorption needs further evaluation.
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