RecruitingPhase 4

Bisphosphonate Prior to Parathyroidectomy in Primary Hyperparathyroidism

Denmark140 participantsStarted 2025-03-01

Plain-language summary

This study is a randomized, double-blinded, placebo-controlled trial investigating the effects of zoledronic acid (ZOL) versus placebo in patients with primary hyperparathyroidism (PHPT) undergoing parathyroidectomy (PTX). PHPT is a common endocrine disorder associated with hypercalcemia, reduced bone mineral density (BMD), increased fracture risk, renal calcifications, and cardiovascular complications. While PTX remains the definitive treatment, the potential role of bisphosphonates in optimizing post-surgical outcomes remains unclear. This trial aims to evaluate whether a single infusion of ZOL prior to PTX impacts bone health, cardiovascular parameters, and renal function one year post-surgery. The primary endpoint is the change in areal bone mineral density (aBMD) at the lumbar spine one year after PTX. Secondary endpoints include changes in aBMD at other skeletal sites, volumetric BMD, bone microarchitecture, bone turnover markers, coronary artery calcium score, arterial stiffness, and renal calcifications. A total of 140 postmenopausal women and men over 50 years with PHPT and low BMD will be enrolled and randomized to receive either ZOL or placebo 2-4 weeks before PTX. Participants will undergo extensive imaging, biochemical analysis, and cardiovascular assessments at baseline and one year post-surgery. This study seeks to clarify whether ZOL improves post-surgical bone recovery or interferes with the natural bone remodeling process following PTX. Additionally, it will provide insight into the cardiovascular and renal effects of bisphosphonate therapy in PHPT patients. Findings may help guide treatment strategies for optimizing long-term skeletal and systemic health in this patient population.

Who can participate

Age range

50 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion criteria

. Postmenopausal females or males \> 50 years
. A diagnosis of hyperparathyroid hypercalcemia due to sporadic PHPT referred to PTX
. aBMD T-score ≤ -1 at total hip, femoral neck, or lumbar spine
. 25-hydroxyvitamin D ≥ 50 nmol/l prior to randomization
. Willingness to undergo PTX

Exclusion criteria

. Known or suspected familial ethology (e.g., MEN1 or 2)
. Estimated glomerular filtration rate \< 35 ml/min

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Effects of ZOL vs. placebo at time of parathyroidectomy based on change in aBMD at lumbar spine meased at baseline compared to one year after PTX.

Timeframe: 12 months (one year)

Trial details

NCT IDNCT06859580

SponsorUniversity of Aarhus

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2028-02-01

Contact for this trial

Anne Louise Vandsø Svenningsen, MD

+45 60183895 ansvnn@rm.dk

View on ClinicalTrials.gov More Primary Hyperparathyroidism trials