HEXT (Hypo EXTended): Effect of PTH on Skeleton in Hypoparathyroidism
This is an open-label study of PTH(1-84) treatment that seeks:
- To determine the actions of PTH(1-84) to provide long term control of serum calcium and urinary calcium excretion with use of standard amounts of calcium and vitamin D supplementation.
- To determine the extent to which PTH(1-84) improves quality-of-life on long-term basis.
- To establish the safety of PTH(1-84) when administered for up to 12 years.
- To attempt to quantify improvements in the typical signs/symptoms of hypoparathyroidism post PTH administration.
There will be one visit conducted every six months in the study offices of the principal investigator, Dr. John Bilezikian. In addition to these visits, there will be, for new patients who have not used PTH (1-84) before, a Screening Visit four weeks prior to the baseline visit for the purpose of performing screening labs as well as a Pre-Baseline Local Quest Lab performed to ensure stability prior to Baseline.
|Study Design:||Intervention Model: Single Group Assignment
Masking: No masking
Primary Purpose: Treatment
|Official Title:||HEXT: The Hypoparathyroidism Studies, EXTended: The Effect of PTH on the Skeleton in Hypoparathyroidism|
- Change in Dose of Calcium Supplementation [ Time Frame: Baseline vs. Up to 12 Years ]Serum and urinary calcium levels maintained by change in requirements for calcium supplementation.
- Percent Change in BMD by DXA [ Time Frame: Baseline vs. Up to 12 Years ]Bone Mineral Density (BMD) as measured by Dual Energy X-Ray Absorptiometry (DXA).
|Study Start Date:||December 2009|
|Estimated Study Completion Date:||December 2017|
|Estimated Primary Completion Date:||June 2017 (Final data collection date for primary outcome measure)|
Experimental: open-label PTH(1-84)
open-label PTH(1-84) / variable dosing: 25mcg every other day, 25mcg every day, 50mcg every day, 75mcg every day, 100mcg every day
Drug: open-label PTH(1-84)
open label PTH(1-84) at either 25mcg every other day, 25mcg every day, 50mcg daily, 75mcg daily, or 100mcg daily
Hypoparathyroidism is a rare disorder in which parathyroid hormone (PTH) is markedly decreased or absent from the circulation. It is the only remaining hormone deficiency state for which replacement with the missing hormone has been heretofore unavailable. The hypoparathyroid state is due either to autoimmune destruction of the parathyroid glands or to loss of parathyroid function after neck surgery. Without PTH, calcium homeostasis is markedly abnormal, the most salient clinical feature of which is a reduced serum calcium concentration. The hypocalcemia is associated with other important abnormalities such as markedly reduced parameters of bone turnover. PTH(1-84) is the ideal therapeutic approach to hypoparathyroidism. The current mainstay of therapy, calcium and vitamin D, has important clinical limitations. Large doses of calcium and vitamin D are required and often associated with hypercalciuria and vitamin D toxicity. Moreover, this approach does not correct the skeletal deficiencies resident in the bones themselves due to lack of PTH. In contrast, PTH(1-84) replaces precisely what is missing in this disorder. The research question is: What are the long-term safety and efficacy parameters of PTH(1-84) therapy in hypoparathyroidism?
Preliminary data suggest that treatment with PTH(1-84) for up to 4 years improves control of the serum and urine calcium concentration safely. Since hypoparathyroidism is a chronic disorder, it is important to know whether these salutary effects continue to be seen beyond 4 years. There is a need to determine the safety and efficacy treatment of PTH(1-84) in hypoparathyroidism beyond 4 years.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01199614
|United States, New York|
|Columbia University Medical Center|
|New York, New York, United States, 10032|
|Principal Investigator:||John P Bilezikian, MD||Columbia University|