Use of gallium to treat Paget's disease of bone: a pilot study.
case_series · Level IV
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Abstract
The effects of gallium nitrate on bone turnover were evaluated in four patients with active Paget's disease. Treatment with gallium nitrate (100 mg/m2 daily for 5 days, intravenously in 5% glucose) significantly reduced serum calcium, serum phosphate, urinary calcium, and the ratio of maximum tubular reabsorption of phosphate to glomerular filtration rate in each patient. Serum parathyroid hormone levels rose. The findings suggest that the fall in serum calcium caused secondary hyperparathyroidism, resulting in a fall in serum phosphate. Serum alkaline phosphatase and urinary hydroxyproline levels fell substantially, showing that gallium effectively suppressed bone turnover. The fall in hydroxyproline excretion preceded that in serum alkaline phosphatase, suggesting that suppression of bone resorption by osteoclasts preceded that of bone formation by osteoblasts. Alkaline phosphatase levels remained low throughout follow-up (85-141 days), so the effect of gallium seems to be long-lasting.