Effects of Parathyroid Hormone in Men With Osteoporosis
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|ClinicalTrials.gov Identifier: NCT00000427|
Recruitment Status : Completed
First Posted : January 19, 2000
Last Update Posted : December 9, 2013
|Condition or disease||Intervention/treatment||Phase|
|Osteoporosis||Drug: Parathyroid hormone Drug: Alendronate||Phase 3|
Osteoporosis causes bones to weaken and break more easily. Alendronate is used to treat or prevent osteoporosis. PTH is a protein hormone that increases the calcium and phosphorus release from bone, leading to formation of new bone. This study will examine the changes in bone density measured at multiple places in the skeleton and changes in chemicals in the body that indicate bone breakdown and bone formation. The study will indicate whether some breakdown of bone is required for PTH to have an overall bone-building effect in men.
Participants will be randomly assigned to receive PTH alone by daily injection under the skin, alendronate alone taken by mouth, or both PTH and alendronate. The study will last 2.5 years. All participants will receive some form of treatment for osteoporosis. Blood, urine, and bone density tests will be performed at 6-month intervals. During the first 6 months, participants will come in for additional study visits.
Participants who complete the initial 2.5 years of their assigned treatment will be eligible for a 12 month extension to monitor bone density and bone turnover after PTH is stopped. Participants who were receiving alendronate will continue taking alendronate. The goal of this extension is to determine what happens to bone density and turnover after PTH is stopped and whether alendronate is needed to prevent loss of PTH-induced bone gain.
Participants who complete the 12 month extension while on their assigned treatment will be eligible for a second 12 month extension in which all participants receive PTH therapy. Participants who have been receiving alendronate continue taking alendronate. The goal of the second extension is to determine if responsiveness to PTH is enhanced by a 12 month suspension of PTH treatment.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||81 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||None (Open Label)|
|Official Title:||Anabolic Actions of Parathyroid Hormone in Osteoporotic Men|
|Study Start Date :||September 1999|
|Primary Completion Date :||October 2005|
|Study Completion Date :||October 2005|
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00000427
|United States, Massachusetts|
|Massachusetts General Hospital|
|Boston, Massachusetts, United States, 02114|
|Principal Investigator:||Joel S. Finkelstein, MD||Massachusetts General Hospital|