RACE (Open-label Study Investigating the Safety and Tolerability of NPSP558, a Recombinant Human Parathyroid Hormone [rhPTH(1-84)], for the Treatment of Adults With Hypoparathyroidism—A Clinical Extension Study; ClinicalTrials.gov identifier, NCT01297309) was an open-label extension study designed to assess long-term safety and efficacy of rhPTH(1-84) in patients with hypoparathyroidism. This evidence concerns the gene PTH and hypoparathyroidism.