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  • Title: Evaluation of serum parathyroid hormone-related peptide in hyperthyroid patients.
    Author: Giovanella L, Suriano S, Keller F, Borretta G, Ceriani L.
    Journal: Eur J Clin Invest; 2011 Jan; 41(1):93-7. PubMed ID: 20874853.
    Abstract:
    BACKGROUND: Hypercalcemia occurs in 10-20% of patients with hyperthyroidism, but its pathogenesis is still unclear. AIM: To evaluate changes in parathyroid hormone-related peptide (PTH-rP) concentration in hyperthyroid patients compared with healthy controls. METHODS: We studied PTH-rP, parathormone (PTH) and ionized calcium levels in 153 hyperthyroid patients, and 89 control subjects. These variables were revaluated after attainment of euthyroidism with the antithyroid drug carbimazole for 6 months in a subgroup of 47 patients. RESULTS: Pretreatment PTH-rP and ionized calcium level were significantly higher in hyperthyroid patients than in controls, whereas an opposite trend occurred for PTH. All parameters normalized after carbimazole therapy. CONCLUSION: Untreated hyperthyroid patients exhibited a significant elevation in serum ionized calcium and PTH-rP and a significant reduction in serum PTH levels when compared with healthy controls. Our data favoured the hypothesis of a direct involvement of PTH-rP in the pathogenesis of hypercalcemia in hyperthyroid patients.
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