Treatment Patterns, Biochemical Profiles and Clinical Outcomes in Adults With X-Linked Hypophosphatemia (IBIS XLH)

May 19, 2026 updated by: Novo Nordisk A/S

Treatment Patterns, Biochemical Profiles and Clinical Outcomes in Adults With X-Linked Hypophosphatemia - A Prospective Observational Cohort Study - IBIS XLH

The purpose of this study is to better understand how X-linked hypophosphatemia (XLH) affects the body and daily life. Phosphate levels are critical in managing XLH, we aim to study how these levels change in patients taking burosumab and how they relate to bone health, overall disease burden and XLH-related conditions.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
100

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Australia
    • New South Wales
      • St Leonards, New South Wales, Australia, 2065
        • Northern Sydney Cancer Centre-Royal North Shore Hospital (RNSH)
      • Westmead, New South Wales, Australia, 2145
        • Westmead Hospital
    • Victoria
      • Clayton, Victoria, Australia, 3168
        • Monash University - Monash Medical Centre (MMC)
  • Canada
    • Ontario
      • Oakville, Ontario, Canada, L6M 1M1
        • Bone Research and Education Centre
  • France
      • Le Kremlin, France, 94275
        • CHU de Bicetre
      • Paris, France, 75014
        • Hopital Cochin - APHP
  • Germany
      • Berlin, Germany, 13353
        • Charite Campus Virchow
      • Göttingen, Germany, 37075
        • Endokrinologikum Goettingen
      • Wuezburg, Germany, 97074
        • Universitat Wurzburg Koenig-Ludwig-Haus
  • Italy
      • Milan, Italy, 20145
        • Istituto Auxologico Italiano
      • Padova, Italy, 35128
        • Azienda Ospedaliera di Padova - U.O.C. di Gastroenterologia
      • Rome, Italy, 00128
        • Fondazione Policlinico Universitario Campus Bio-Medico
    • Florence
      • Sesto Fiorentino, Florence, Italy, 50019
        • Office of Francesco Di Costanzo, MD
  • Japan
      • Osaka, Japan, 553-0003
        • Japan Community Healthcare Organization Osaka Hospital
      • Osaka, Japan, 530-0052
        • Iseikai International General Hospital
    • Fukuoka
      • Fukuoka, Fukuoka, Japan, 814-0180
        • Fukuoka University - Fukuoka University Hospital
    • Okayama-ken
      • Okayama, Okayama-ken, Japan, 700-0013
        • Okayama Saiseikai Outpatient Center Hospital
    • Tokyo
      • Bunkyo-ku, Tokyo, Japan, 113-8655
        • The University of Tokyo Hospital
  • Netherlands
      • Leiden, Netherlands, 2333 ZA
        • Leiden University Medical Center (Leids Universitair Medisch Centrum (LUMC))
  • United States
    • Connecticut
      • New Haven, Connecticut, United States, 06510
        • Yale University School of Medicine
    • Indiana
      • Indianapolis, Indiana, United States, 46202-5271
        • Indiana University Hospital
    • Ohio
      • Columbus, Ohio, United States, 43203
        • The Ohio State University Wexner Medical Center (OSUWMC) - CarePoint East
    • Tennessee
      • Nashville, Tennessee, United States, 37232-8148
        • Vanderbilt University Medical Center

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Adults with XLH, confirmed genetically or clinically as determined by the investigator, who have been treated with burosumab for at least 90 days prior to the screening/baseline visit and whose treatment is still ongoing. Participants will be followed for a maximum of three years, continuing until end of trial visit, withdrawal of consent or loss to follow-up, whichever occurs first.

Description

Inclusion Criteria:

  • Informed consent obtained before any trial-related activities, i.e., any procedure related to recording of data according to the protocol.
  • Male or female and aged 18-64 years (both inclusive) at the time of signing informed consent.
  • Diagnosis of congenital XLH, confirmed genetically or clinically as determined by the investigator, supported by documentation.
  • Participants have been treated with burosumab for at least 90 days prior to the screening/baseline visit and treatment is still ongoing.
  • Participant confirms ability and willingness to attend visits according to routine clinical care and mandatory assessments at the site.

Exclusion Criteria:

  • Previous rescreening for this trial.
  • Current participation in any interventional clinical trial. Participation in another non-interventional trial, such as a patient registry trial, is permitted.
  • Any condition not associated with XLH, which in the investigator's opinion might jeopardise participant's safety or compliance with the protocol.

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

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Adults with XLH
Adults with XLH, confirmed genetically or clinically as determined by the investigator, who have been treated with burosumab for at least 90 days prior to the screening/baseline visit and whose treatment is still ongoing will be followed for a maximum of three years, continuing until end of trial visit, withdrawal of consent or loss to follow-up, whichever occurs first.
Other: No treatment given
No treatment given

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Average Trough Serum Phosphate Concentration
Time Frame: From baseline to last assessment (Up to 3 years)
Average trough serum phosphate concentration, defined as the area under the concentration-time curve (AUC) divided by the total duration of the assessment period (AUC divided by time). Measured in milligrams per deciliter (mg/dL).
From baseline to last assessment (Up to 3 years)

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Novo Nordisk A/S

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Clinical Transparency dept. 2834, Novo Nordisk A/S

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 (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 7, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 7, 2030

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 7, 2030

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 19, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 19, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 26, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 26, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 19, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
April 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • NN8661-8325

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

According to the Novo Nordisk disclosure commitment on novonordisk-trials.com

Drug and device information, study documents

Studies a U.S. FDA-regulated device product

No

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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