Etidronate for Arterial Calcifications Due to Deficiency in CD73 (ACDC)

Study Results

Results available

Outcome measurements, participant flow, baseline characteristics, and adverse events have been published for this study.

View full results

Basic Information

Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.

Recruitment Status

COMPLETED

Clinical Phase

PHASE2

Total Enrollment

7 participants

Study Classification

INTERVENTIONAL

Study Start Date

2012-08-20

Study Completion Date

2021-08-06

Brief Summary

Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.

Background:

* Arterial Calcifications due to Deficiency in CD73 (ACDC) is a rare genetic disease. People with ACDC develop calcification in the arteries of the lower extremities as well as calcium deposit in the joints of the fingers, wrists, ankles and feet. The lower extremities calcification causes claudication because of severe ischemia requiring at time revascularization procedures. the calcium deposits in the joints causes severe debilitating pain in the hands and feet. Currently, there are no standard treatments for ACDC.
* Etidronate is a bisphosphonate that interferes with bone metabolism. It is approved to treat Paget's disease, a condition in which the bones are soft and weak and may be deformed, painful, or easily broken. It is also used to treat high blood calcium levels. Researchers want to see if it can be used to treat the calcifications of ACDC and improve pain and blood flow in the lower extremities and arthritic pain of the hands and feet.

Objectives:

\- To see if etidronate is a safe and effective treatment for ACDC.

Eligibility:

\- People between 18 and 80 years of age who have been diagnosed with ACDC.

Design:

* Participants will be screened with a physical exam and medical history. They will also have imaging studies, including CT scan of the lower extremities, x-rays and DEXA bone scans, before starting treatment. Blood and urine samples will be collected. An exercise tolerance test will also be given and ABI (ankle brachial index will be measured.
* Participants will take etidronate by mouth once a day for 14 days every 3 months. They will be assigned an individualized 6- month drug schedule to follow.
* Participants will have regular study visits throughout the treatment period. These visits will involve imaging studies, full dental exams, and blood and urine tests. Participants will also have exercise tolerance tests and ABIs measured.
* Participants may also provide tissue samples for further study.
* Treatment will continue for up to 3 years as long as the side effects are not severe and the condition does not become worse. Participants will have a final follow-up visit after stopping treatment.

Related Clinical Trials

Explore similar clinical trials based on study characteristics and research focus.

Acute Local Metabolomic Alterations in Blood and Muscle Tissue in Intermittent Claudication

NCT05111379

Peripheral Arterial Occlusive Disease Fontaine Stage IIa

UNKNOWN

Patients With Intermittent Claudication Injected With ALDH Bright Cells

NCT01774097

Peripheral Artery Disease Intermittent Claudication

COMPLETED PHASE2

ACP-01 in Patients With Critical Limb Ischemia

NCT02551679

Critical Limb Ischemia

COMPLETED PHASE2

Electrical Stimulation in Peripheral Arterial Disease

NCT02136537

Peripheral Arterial Disease

TERMINATED NA

Activity To Improve Outcomes in Peripheral Arterial Disease

NCT02189018

Peripheral Arterial Occlusive Disease

COMPLETED NA

Detailed Description

Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.

We have recently identified a novel genetic disease affecting nine known adults in whom de novo vascular calcifications develop in the lower extremity arteries and juxta-articular joint capsules of the fingers, wrists, ankles and feet. This rare disease results from bi-allelic mutations in the gene ecto-5-prime-nucleotidase (NT5E), encoding the CD73 protein. CD73, an enzyme involved in the extracellular ATP metabolic pathway, converts extracellular AMP to adenosine and inorganic phosphate. The clinical symptoms of this rare disease, termed ACDC (Arterial Calcifications due to Deficiency in CD73), include claudication of the calves, thighs, and buttocks, chronic ischemic pain of the feet at rest with threat of potential limb loss, and debilitating rheumatoid pain in the wrists and hands. Radiological and histological evaluations do not resemble classic atherosclerotic vascular calcification, since the calcification and dysplasia in ACDC occur in the medial portion of the arterial blood vessel wall. Data from patient-specific cell lines indicate increased activity of tissue non-specific alkaline phosphatase (TNAP), a key mediator of pathological ectopic tissue calcification, and thus reveals a potential therapeutic target.

To date, no effective therapy exists for ACDC patients. However, since bisphosphonates are potent competitive inhibitors of TNAP activity and are widely used to modulate bone metabolism, they may beneficially alter vascular calcification. In addition, our preliminary in vitro studies demonstrate the effectiveness of etidronate, a nitrogen-containing bisphosphonate, in lowering TNAP activity in cells isolated from ACDC patients. Etidronate, and bisphosphonates in general, have proven safe and are well tolerated by most patients.

This protocol provides for the administration of etidronate to ACDC patients, for whom no alternative treatment is available. Patients will be examined at the NIH Clinical Center bi-annually for 3 years. The primary objective of this clinical study is to test the effectiveness of etidronate in attenuating the progression of lower extremity arterial calcification and vascular blood flow based on CT calcium score and Ankle Brachial Index (ABI).

Conditions

See the medical conditions and disease areas that this research is targeting or investigating.

Arterial Calcification CD73 Deficiency

Study Design

Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.

Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

Review each arm or cohort in the study, along with the interventions and objectives associated with them.

Etidronate Treatment for Arterial Calcifications due to Deficiency in CD73 (ACDC)

Participants diagnosed with Arterial Calcifications due to Deficiency in CD73 (ACDC) will receive Etidronate. Etidronate will be administered orally at total dose of 20mg/kg daily x 14 days, followed by 10 weeks off study drug (12 weeks = one cycle). Participants may receive up to 12 cycles of etidronate.

Group Type EXPERIMENTAL

Etidronate

Intervention Type DRUG

Didronel (etidronate disodium)- Didronel tablets contain either 200 mg or 400 mg of etidronate disodium, the disodium salt of (1-hydroxyethylidene) diphosphonic acid, for oral administration. This compound, also known as EHDP. regulates bone metabolism. It is a white powder, highly soluble in water. The 400 mg tablets are white capsule-shaped tablets with ED 400 on one side and G on the other side.

MRI Scan

Intervention Type DEVICE

Visit on day 0 and visit at 36 month - Exploratory MRI studies may be employed to evaluate the lumen of the artery and degree of collateral vessels, given that the high degree of calcification is precluding that evaluation by CT.

Interventions

Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.

Etidronate

Didronel (etidronate disodium)- Didronel tablets contain either 200 mg or 400 mg of etidronate disodium, the disodium salt of (1-hydroxyethylidene) diphosphonic acid, for oral administration. This compound, also known as EHDP. regulates bone metabolism. It is a white powder, highly soluble in water. The 400 mg tablets are white capsule-shaped tablets with ED 400 on one side and G on the other side.

Intervention Type DRUG

MRI Scan

Visit on day 0 and visit at 36 month - Exploratory MRI studies may be employed to evaluate the lumen of the artery and degree of collateral vessels, given that the high degree of calcification is precluding that evaluation by CT.

Intervention Type DEVICE

Other Intervention Names

Discover alternative or legacy names that may be used to describe the listed interventions across different sources.

Etidronate disodium Didronel

Eligibility Criteria

Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.

Exclusion Criteria

* Subjects must be diagnosed with ACDC based on genetic tests confirming mutation(s) in NT5E and evidence of lower extremity arterial calcifications.
* Either gender and any ethnic background or race
* Age 18-80 years
* Willingness and legal ability to give and sign informed study consent
* Willingness to travel to NIH and local sites for scheduled protocol studies and treatment

Subjects who meet any of the following criteria will be excluded from the study:

* Subjects not diagnosed with ACDC
* Subjects \<18 or \>80 years of age
* Subjects who are unable or unwilling to sign an informed consent
* Severe renal impairment (estimated creatinine clearance/eGFR of \< 30ml/min calculated using CKD-EPI equation)
* Longstanding diabetes mellitus (more than 10 years)
* Known abnormality of the esophagus that would interfere with the passage of the drug
* Known sensitivity to etidronate
* Pregnancy
* Any other medical or social condition that, in the opinion of the Principal Investigator, might put the subject at risk of harm during the study or might adversely affect the interpretation of the study data.

Minimum Eligible Age

18 Years

Maximum Eligible Age

80 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No