Role Of Phosphorus And FGF 23 In Patients With Dent Disease

March 19, 2020 updated by: John Lieske, Mayo Clinic
Patients with Dent disease have suppressed levels of FGF 23 which contributes to hypercalciuria, kidney stones, nephrocalcinosis and renal failure. Supplementation with phosphorus may reduce hypercalciuria.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

30

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Minnesota
      • Rochester, Minnesota, United States, 55905
        • Mayo Clinic

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

Male

Description

Inclusion Criteria:

Patients will be recruited from those in the RKSC Dent Registry

  1. Diagnostic criteria for Dent disease Observational arm include:

    1. <18 years old
    2. LMWP (at least 5 times above the upper limit of normal) and at least 1 of the following criteria: 1. Hypercalciuria, 2. Kidney stones, 3. Nephrocalcinosis, 4. Hypophosphatemia, 5. Renal phosphate leak, 6. Aminoaciduria, 7. Glucosuria without diabetes mellitus, 8. Hematuria, 9. Renal insufficiency, 10. Family history with x-linked inheritance or
    3. 1 of the above criteria (1-9) and confirmed genetic mutation of CLCN5 or OCRL1.

  2. Diagnostic criteria for Dent disease Intervention arm include:

    1. >18 years old
    2. LMWP (at least 5 times above the upper limit of normal) and at least 1 of the following criteria: 1. Hypercalciuria, 2. Kidney stones, 3. Nephrocalcinosis, 4. Hypophosphatemia, 5. Renal phosphate leak, 6. Aminoaciduria, 7. Glucosuria without diabetes mellitus, 8. Hematuria, 9. Renal insufficiency, 10. Family history with x-linked inheritance or
    3. 1 of the above criteria (1-9) and confirmed genetic mutation of CLCN5 or OCRL1.

  3. Idiopathic calcium nephrolithiasis with renal phosphate leak

    1. Male patients > 18 years old
    2. History of symptomatic calcium oxalate or calcium phosphate stone, hypercalciuria (>250 mg/24 hrs), renal phosphate leak (TMP/GFR <2.07 mg/dl)

  4. Idiopathic calcium nephrolithiasis without renal phosphate leak

    1. Male patients > 18 years old
    2. History of symptomatic calcium oxalate or calcium phosphate stone, hypercalciuria (>250 mg/24 hrs), renal phosphate leak (TMP/GFR <2.07 mg/dl)

Exclusion Criteria:

  1. Exclusion for Dent disease include: primary or secondary hyperparathyroidism, hyperthyroidism, chronic diarrhea states; intake of thiazide diuretics, glucocorticoids, or estrogens within one month of the study.
  2. Exclusion criteria for calcium stone formers include: primary or secondary hyperparathyroidism, hyperthyroidism, estimated GFR <40 ml/mn/1.73m2, chronic diarrhea states; intake of thiazide diuretics, glucocorticoids, or estrogens within one month of the study.
  3. Exclusion criteria include history of symptomatic or asymptomatic kidney stone disease; primary or secondary hyperparathyroidism; estimated GFR <40 ml/min/1.73m2, chronic diarrhea states; intake of thiazide diuretics, glucocorticoids, or estrogens within one month of the study.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Dent Disease Intervention
Dent Disease subjects will receive 2 week supplementation with phosphorus
Drug: Phosphorus Supplement
250 mg po qid
Other Names:
  • K-phos neutral
Experimental: Kidney Stone subjects
Kidney stone with or without phosphate leak subjects will receive 2 week supplementation with phosphorus
Drug: Phosphorus Supplement
250 mg po qid
Other Names:
  • K-phos neutral
Placebo Comparator: Dent Disease Observation
Dent disease subjects will not get phosphorus
Other: Observation
Baseline blood and urine measurements only

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in Urine Total Protein
Time Frame: baseline, day 7
Urine protein tests detect and/or measure protein being released into the urine. Normal urine protein elimination is less than 150 mg/day
baseline, day 7

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Mayo Clinic

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2014

Primary Completion (Actual)

January 1, 2019

Study Completion (Actual)

January 1, 2019

Study Registration Dates

First Submitted

December 6, 2013

First Submitted That Met QC Criteria

December 13, 2013

First Posted (Estimate)

December 19, 2013

Study Record Updates

Last Update Posted (Actual)

March 23, 2020

Last Update Submitted That Met QC Criteria

March 19, 2020

Last Verified

March 1, 2020

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 13-004774

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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