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Purpose The main purpose of this study was to investigate the effects of 12 months of rhPTH (1–84) (Natpar ® ) treatment in a cohort of patients selected according to the indications of hypoparathyroidism guidelines. The use of recombinant human PTH (1–84) [rhPTH (1–84)] is approved as hormonal replacement therapy in patients with hypoparathyroidism not adequately controlled with conventional therapy. Methods It is a multicenter, observational, retro-prospective, open label study. Eleven Italian Endocrinological centers, members of Hypoparathyroidism Working Group of the Italian Society of Endocrinology (HypoparaNET) were involved. Main outcome measures were serum and urinary calcium and phosphate concentration, calcium-phosphate product, renal function, oral calcium and vitamin D doses, and clinical manifestations. Results Fourteen adult subjects, affected by chronic hypoparathyroidism, were treated with rhPTH (1–84) for 12 months. At 12 months of rhPTH (1–84) treatment, 61.5% of patients discontinued calcium supplement and 69.2% calcitriol. Mean albumin-adjusted total serum calcium levels quickly normalized after initiation of rhPTH (1–84) treatment compared to baseline ( p  = 0.009), remaining in the normal range until 12 months. Rare hypo-hypercalcemia episodes were reported. Renal function was maintained normal and no renal complications were reported. Serum and urinary phosphate and urinary calcium were maintained in the normal range. Mean phosphatemia levels linearly decreased from 3 months up to 12 months compared to baseline ( p  = 0.014). No severe adverse events were described. Conclusions Biochemical and clinical results confirm the efficacy and safety of rhPTH (1–84) therapy, which represents an important option for hypoparathyroid patients unresponsive to conventional therapy.

Multicenter retro-prospective observational study on chronic hypoparathyroidism and rhPTH (1–84) treatment