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  • Title: Therapy of Hypoparathyroidism With rhPTH(1-84): A Prospective, 8-Year Investigation of Efficacy and Safety.
    Author: Tay YD, Tabacco G, Cusano NE, Williams J, Omeragic B, Majeed R, Gomez Almonte M, Bilezikian JP, Rubin MR.
    Journal: J Clin Endocrinol Metab; 2019 Nov 01; 104(11):5601-5610. PubMed ID: 31310310.
    Abstract:
    CONTEXT: Conventional treatment of hypoparathyroidism is associated with decreased renal function and increased bone mineral density (BMD). OBJECTIVE: To evaluate the effects of 8 years of recombinant human parathyroid hormone (1-84) [rhPTH(1-84)] therapy on key biochemical and densitometric indices. DESIGN: Prospective open-label trial. SETTING: Tertiary medical center. PARTICIPANTS: Twenty-four subjects with hypoparathyroidism. INTERVENTION: Treatment with rhPTH(1-84) for 8 years. MAIN OUTCOME MEASURES: Supplemental calcium and vitamin D requirements, serum calcium and phosphorus levels, calcium-phosphate product, urinary calcium excretion, estimated glomerular filtration rate (eGFR) and BMD. RESULTS: PTH therapy was associated with progressive reduction in supplemental calcium (57%; P < 0.01) and active vitamin D (76%; P < 0.001) requirements over 8 years. Serum calcium concentration was stable; urinary calcium excretion declined 38% (P < 0.01). eGFR remained stable and was related to baseline eGFR and serum calcium levels. Calcium-phosphate product was below the recommended limit; serum phosphorus remained within normal range. Lumbar spine and total hip BMD increased, peaking at 4 (mean ± SE, 4.6% ± 1.5%; P = 0.01) and 8 years (2.6% ± 1.1%; P = 0.02), whereas femoral neck BMD did not change and one-third radius BMD decreased (mean ± SE, -3.5% ± 1.1%; P = 0.001). BMD at all sites was higher throughout the 8 years than in the age- and sex-matched reference population. Hypercalcemia and hypocalcemia were uncommon. CONCLUSION: rhPTH(1-84) is a safe and effective treatment for hypoparathyroidism for 8 years. Long-term reductions in supplemental requirements and biochemical improvements with stable renal function are maintained.
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