Summary
The biochemical parameters of bone mineral metabolism in patients with nonhypercalcemic malignancy have not been extensively investigated. Therefore, a group of 29 such patients with different types of malignancy was studied. Ten patients received corticosteroids. In the entire group, serum ionized calcium (Ca2+), bone gla protein (BGP), 25-hydroxyvitamin D (25OHD), and 1,25-dihydroxyvitamin D (1,25(OH)2D) were all lower than in age-matched controls, and carboxy-terminal parathyroid hormone (CPTH) was higher. Although both corticosteroid- and noncorticosteroid-treated patients had decreased BGP values, the corticosteroid-treated patients had lower BGP levels than those not on steroids (4.24±0.70 SE vs. 11.50±2.20 ng/ml;P<0.005). Patients on corticosteroids had lower 1,25(OH)2D values than controls (18.81 ±2.71 vs. 27.83±1.17 pg/ml;P<0.01), whereas those not on corticosteroids had normal 1,25(OH)2D values. These results suggest that patients with nonhydpercalcemic malignancy have nutritional vitamin-D deficiency and secondary hyperparathyroidism with perhaps corticosteroid-induced suppression of serum 1,25(OH)2D and BGP. The decreased levels of serum BGP in the nonsteroid-treated patients suggest, in addition, a defect in osteoblast function.
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Jowell, P.S., Epstein, S., Ismail, F. et al. Alteration in osteoblast activity and nutritional vitamin-D deficiency in non-hypercalcemic malignancy. Calcif Tissue Int 42, 18–22 (1988). https://doi.org/10.1007/BF02555834
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DOI: https://doi.org/10.1007/BF02555834