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Once Weekly Parathyroid Hormone for Osteoporosis

This study has been completed.
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Information provided by (Responsible Party):
University of California, San Francisco Identifier:
First received: July 29, 2003
Last updated: February 4, 2013
Last verified: February 2013
Daily parathyroid hormone (PTH) is approved by the FDA for the treatment of osteoporosis. This study will evaluate the safety and effectiveness of PTH when given once a week.

Condition Intervention Phase
Drug: Teriparatide
Drug: Placebo teriparatide
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Double-Blind
Primary Purpose: Treatment
Official Title: PTH Once Weekly Research (POWR)

Resource links provided by NLM:

Further study details as provided by University of California, San Francisco:

Primary Outcome Measures:
  • Bone mineral density [ Time Frame: Months 6 and 12 ]

Estimated Enrollment: 50
Study Start Date: December 2003
Study Completion Date: September 2005
Primary Completion Date: September 2005 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Women will self-administer PTH injections daily for 4 weeks, then once weekly for 48 weeks
Drug: Teriparatide
Synthetic human parathyroid hormone
Placebo Comparator: 2
Women will self-administer placebo injections daily for 4 weeks, then once weekly for 48 weeks
Drug: Placebo teriparatide
Placebo injections

Detailed Description:

In osteoporosis, skeletal bone mass and strength are so reduced that fractures occur after only modest levels of mechanical stress that would not harm normal bone. Fractures of the hip, spine, and wrists are most typical, though fractures of the ribs, pelvis, and humerus also occur. Research has shown that hip fractures cause a 10% to 20% increase in mortality, and the cost of all osteoporotic fractures is estimated to be $6.14 billion in health care costs and lost earnings per year. The most common form of osteoporosis is postmenopausal osteoporosis. A reduction in bone mineral density of approximately 1% to 2% per year is observed for the first 3 to 5 years after the onset of menopause, then 0.5% to 1% per year thereafter.

PTH was recently approved by the FDA as a daily treatment for osteoporosis. However, PTH must be self-injected, is very expensive, and has been associated with worrisome side effects. The currently approved formulation of daily PTH self-injections is practical for only a small proportion of people with osteoporosis. A once weekly formulation could significantly decrease cost, difficulty of administration, and risks and side effects associated with daily use of PTH. A once weekly injection by a caregiver would also make PTH accessible to populations for whom daily self-injection may not be practical, such as the very elderly or those in assisted living or nursing homes. This study will evaluate the safety and effectiveness of once weekly PTH dosing for women with osteoporosis.

Women will be randomized to receive either PTH or placebo. Women will self-administer injections daily for 4 weeks, then once weekly for 48 weeks. All women will receive calcium and vitamin D supplements daily. Women will visit the clinic six times over the course of a year and will provide urine and blood samples at each visit. Bone mineral density will be measured at 6 and 12 months.


Ages Eligible for Study:   45 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Bone mineral density scan with a T-score between -1 and -2
  • Willing to self-administer injections
  • Postmenopausal

Exclusion Criteria:

  • Medications to treat osteoporosis, including: hormone replacement therapy for more than one month in the 6 months prior to study, or for more than 12 months in the 2 years prior to study; alendronate, risedronate, or etidronate for more than 1 year anytime prior to study; calcitonin in the 3 months prior to study; taken raloxifene or tamoxifen in the last 6 months or for more than 1 year in the 2 years prior to study; fluoride for more than 1 month in the 5 years prior to study
  • Bone fracture since menopause
  • Femoral neck T-score below -2 AND lumbar spine T-score below -2.5 OR femoral neck T-score below -2.5 AND T-scores of both total hip and lumbar spine below -2
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00065637

United States, Maine
St Joseph Hospital
Bangor, Maine, United States, 04401
Sponsors and Collaborators
University of California, San Francisco
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Principal Investigator: Clifford Rosen, MD St. Joseph Hospital Health Center
  More Information

Responsible Party: University of California, San Francisco Identifier: NCT00065637     History of Changes
Other Study ID Numbers: N01 AR32268
N01AR002245-000 ( US NIH Grant/Contract Award Number )
Study First Received: July 29, 2003
Last Updated: February 4, 2013

Additional relevant MeSH terms:
Bone Diseases, Metabolic
Bone Diseases
Musculoskeletal Diseases
Bone Density Conservation Agents
Physiological Effects of Drugs processed this record on May 23, 2017