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Effects of Parathyroid Hormone in Men with Osteoporosis
This study is no longer recruiting patients.
Sponsored by: | National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) |
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Information provided by: | National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) |
Purpose
Alendronate is a drug that blocks or reduces bone loss, while parathyroid hormone (PTH) stimulates the formation of new bone. The purpose of this study is to compare the bone-building effects of PTH alone, alendronate alone, and both PTH and alendronate in men with osteoporosis over a two-and-a-half year period.
Condition | Treatment or Intervention | Phase |
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Osteoporosis |
Drug: Parathyroid hormone Drug: Alendronate |
Phase III |
MedlinePlus related topics: Osteoporosis
Study Type: Interventional
Study Design: Treatment, Randomized, Open Label, Active Control, Parallel Assignment, Safety/Efficacy Study
Official Title: Anabolic Actions of Parathyroid Hormone in Osteoporotic Men
Expected Total Enrollment: 81
Study start: September 1999;
Study completion: July 2004
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.
Eligibility
Ages Eligible for Study: 46 Years - 85 Years, Genders Eligible for Study: Male
Criteria
Inclusion Criteria:
Exclusion Criteria:
Location Information
More Information
Publications
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National Institutes of Health, Department of Health & Human Services | ||||||||||||||
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