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Old asthma drug could help kids with rare bone and hormone disorder

NCT ID NCT04551170

Disease control Sponsor: Vanderbilt University Medical Center Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This phase 2 trial tests theophylline, a drug used for asthma, in 34 children aged 2 to 12 with pseudohypoparathyroidism, a genetic condition causing obesity, short stature, and hormone resistance. The study aims to see if theophylline can help with weight loss, slow bone growth plate closure, and reduce hormone resistance. Results are not yet available.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
theophylline
What this could lead to
If it works, this could point toward a new treatment to help children with pseudohypoparathyroidism lose weight and reduce hormone resistance.
What could go wrong
This is a small early-phase trial with only 34 children, so results may not apply to everyone. Theophylline can cause side effects like nausea or heart issues, and it may not prove effective.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 34 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jul 2020

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

2 to 12 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age 2 to 12 years old * Clinical diagnosis of PHP (per the EuroPHP network classification guidelines5): Presence of PTH resistance and/or ectopic ossification OR brachydactyly type E plus 2 minor criteria (TSH resistance, other hormonal resistance, developmental delay, intrauterine or post-natal growth retardation, obesity/overweight, specific facial features) * Obesity (BMI \>95th percentile for age/gender and/or ≥30 kg/m2) Exclusion Criteria: 1. Use of a PDE inhibitor in the past 30 days 2. History of a seizure disorder unrelated to hypocalcemia 3. History of a cardiac arrhythmia (not including bradycardia) 4. Hepatic insufficiency including cirrhosis and acute hepatitis (AST or ALT \>3x upper limit of normal) 5. Congestive heart failure 6. Current cigarette use or alcohol abuse 7. Pregnancy or intention to become pregnant during the next year 8. Untreated hypothyroidism (defined as free thyroxine below the lower limit of normal) 9. Active peptic ulcer disease 10. Current use of medications known to effect theophylline levels (see protection of human subjects) 11. History of hypersensitivity to theophylline or other medication components 12. History of Major Depressive Disorder in the past 2 years, lifetime history of suicide attempt, history of any suicidal behavior in the past month, history of other sever psychiatric disorders (e.g. schizophrenia, bipolar disorder) 13. PHQ-9 score is ≥15 or suicidal ideation of type 4 or 5 (C-SSR) in the past month 14. Untreated hypothyroidism or uncontrolled PTH resistance (PTH \>2x upper limit of normal), or treatment of these disorders by medications other than calcitriol or levothyroxine (such as Cytomel or Armour thyroid) 15. Unable to comply with study procedures in the opinion of the investigator

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Conditions

The condition(s) this trial relates to.

pseudohypoparathyroidism pseudohypoparathyroidism type 1A

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Albright hereditary osteodystrophy Pseudohypoparathyroidism Pseudohypoparathyroidism type 1A

Contacts and locations

Locations

  • Vanderbilt University Medical Center

    Nashville, Tennessee, 37212, United States

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