Alteration in osteoblast activity and nutritional vitamin-D deficiency in non-hypercalcemic malignancy.
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 less than 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 less than 0.01), whereas those not on corticosteroids had normal 1,25(OH)2D values. These results suggest that patients with nonhypercalcemic 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.
D000368:Aged; D001851:Bone Diseases, Metabolic / Q000378:metabolism; D001842:Bone and Bones / Q000378:metabolism; D005260:Female; D006801:Humans; D006934:Hypercalcemia / Q000378:metabolism / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D008903:Minerals / Q000378:metabolism; D009362:Neoplasm Metastasis / Q000503:physiopathology*; D010006:Osteoblasts / Q000378:metabolism / Q000503:physiopathology*; D014808:Vitamin D Deficiency / Q000378:metabolism / Q000503:physiopathology*
D008903:Minerals