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    Clinical Trial Results:
    An Open-Label, Single-Arm, Phase 3 Study to Evaluate the Effects of KRN23 on Osteomalacia in Adults with X-linked Hypophosphatemia (XLH)

    Summary
    EudraCT number
    2015-001775-41
    Trial protocol
    DK   FR  
    Global end of trial date
    13 Dec 2018

    Results information
    Results version number
    v1(current)
    This version publication date
    29 Dec 2019
    First version publication date
    29 Dec 2019
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    UX023-CL304
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT02537431
    WHO universal trial number (UTN)
    -
    Other trial identifiers
    EMA/902676: Unique Product Identifier
    Sponsors
    Sponsor organisation name
    Ultragenyx Pharmaceutical Inc.
    Sponsor organisation address
    60 Leveroni Court, Novato, United States, California 94949
    Public contact
    Medical Information, Ultragenyx Pharmaceutical Inc., 1 8887568567, medinfo@ultragenyx.com
    Scientific contact
    Medical Information, Ultragenyx Pharmaceutical Inc., 1 8887568567, medinfo@ultragenyx.com
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    No
    Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Results analysis stage
    Analysis stage
    Final
    Date of interim/final analysis
    13 Dec 2018
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    13 Dec 2018
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    The primary objective of this study is to establish the effect of KRN23 treatment on improvement in XLH-associated osteomalacia as determined by osteoid volume (osteoid volume/bone volume, OV/BV).
    Protection of trial subjects
    The trial was designed, conducted, recorded, and reported in accordance with the principles established by the 18th World Medical Association General Assembly (Helsinki, 1964) and subsequent amendments and clarifications adopted by the General Assemblies. The investigators made every effort to ensure that the study was conducted in full conformance with Helsinki principles, International Council for Harmonization (ICH) Good Clinical Practice (GCP) guidelines, current Food and Drug Administration (FDA) regulations, EU Clinical Trial Directive 2001/20/EC, and local ethical and regulatory requirements. Each investigator was thoroughly familiar with the appropriate administration and potential risks of administration of the study drug, as described in the protocol and Investigator’s Brochure, prior to the initiation of the study. The method of obtaining and documenting informed consent and the contents of the informed consent form (ICF) complied with ICH GCP guidelines, the requirements of 21 CFR Part 50, “Protection of Human Subjects,” the Health Insurance Portability and Accountability Act regulations, and all other applicable regulatory requirements. Investigators were responsible for preparing the ICF and submitting it to the Sponsor for approval prior to submission to the Institutional Review Board (IRB). All ICFs were written in regional language and contained the minimum elements for consent as mandated by the ICH guidelines. An IRB-approved ICF was provided by the Sponsor prior to initiation of the study. Investigators obtained signed written informed consent from each potential study subject prior to the conduct of any study procedures and after the methods, objectives, requirements, and potential risks of the study were fully explained to each potential subject. Consent for participation could be withdrawn at any time for any reason by the subject.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    23 Dec 2015
    Long term follow-up planned
    No
    Independent data monitoring committee (IDMC) involvement?
    Yes
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    France: 1
    Country: Number of subjects enrolled
    United States: 9
    Country: Number of subjects enrolled
    Japan: 4
    Worldwide total number of subjects
    14
    EEA total number of subjects
    1
    Number of subjects enrolled per age group
    In utero
    0
    Preterm newborn - gestational age < 37 wk
    0
    Newborns (0-27 days)
    0
    Infants and toddlers (28 days-23 months)
    0
    Children (2-11 years)
    0
    Adolescents (12-17 years)
    0
    Adults (18-64 years)
    14
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    -

    Pre-assignment
    Screening details
    Potential subjects came in to the site to sign informed consent and complete the initial Screening. Subjects were contacted by telephone within 1 week of the Screening visit to communicate available test results related to eligibility.

    Period 1
    Period 1 title
    Open-Label Period (Week 0 to Week 48)
    Is this the baseline period?
    Yes
    Allocation method
    Not applicable
    Blinding used
    Not blinded

    Arms
    Arm title
    Open-Label Burosumab Q4W
    Arm description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.
    Arm type
    Experimental

    Investigational medicinal product name
    burosumab
    Investigational medicinal product code
    KRN23
    Other name
    UX023, Crysvita
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    The amount of drug administered was calculated based on Baseline weight, up to a maximum dose of 90 mg.

    Number of subjects in period 1
    Open-Label Burosumab Q4W
    Started
    14
    Completed
    13
    Not completed
    1
         Consent withdrawn by subject
    1
    Period 2
    Period 2 title
    Treatment Extension Period I
    Is this the baseline period?
    No
    Allocation method
    Not applicable
    Blinding used
    Not blinded

    Arms
    Arm title
    Open-Label Burosumab Q4W
    Arm description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.
    Arm type
    Experimental

    Investigational medicinal product name
    burosumab
    Investigational medicinal product code
    KRN23
    Other name
    UX023, Crysvita
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    The amount of drug administered was calculated based on Baseline weight, up to a maximum dose of 90 mg.

    Investigational medicinal product name
    burosumab
    Investigational medicinal product code
    KRN23
    Other name
    UX023, Crysvita
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    The amount of drug administered was calculated based on Baseline weight, up to a maximum dose of 90 mg.

    Number of subjects in period 2
    Open-Label Burosumab Q4W
    Started
    13
    Completed
    13
    Period 3
    Period 3 title
    Treatment Extension Period II
    Is this the baseline period?
    No
    Allocation method
    Not applicable
    Blinding used
    Not blinded

    Arms
    Arm title
    Open-Label Burosumab Q4W
    Arm description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.
    Arm type
    Experimental

    Investigational medicinal product name
    burosumab
    Investigational medicinal product code
    KRN23
    Other name
    UX023, Crysvita
    Pharmaceutical forms
    Solution for injection
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    The amount of drug administered was calculated based on Baseline weight, up to a maximum dose of 90 mg.

    Number of subjects in period 3 [1]
    Open-Label Burosumab Q4W
    Started
    8
    Completed
    8
    Notes
    [1] - The number of subjects starting the period is not consistent with the number completing the preceding period. It is expected the number of subjects starting the subsequent period will be the same as the number completing the preceding period.
    Justification: 5 subjects completing Treatment Extension Period I did not enter Treatment Extension Period II

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    Open-Label Burosumab Q4W
    Reporting group description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.

    Reporting group values
    Open-Label Burosumab Q4W Total
    Number of subjects
    14 14
    Age categorical
    Units: Subjects
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    40.13 ( 8.725 ) -
    Gender categorical
    Units: Subjects
        Female
    8 8
        Male
    6 6
    Ethnicity
    Units: Subjects
        Hispanic or Latino
    1 1
        Not Hispanic or Latino
    13 13
        Unknown or Not Reported
    0 0
    Race
    Units: Subjects
        American Indian or Alaska Native
    0 0
        Asian
    4 4
        Native Hawaiian or Other Pacific Islander
    0 0
        Black or African American
    1 1
        White
    9 9
        More than one race
    0 0
        Unknown or Not Reported
    0 0
    Osteoid Volume/Bone Volume (OV/ BV)
    Percent of a given volume of bone tissue that consists of unmineralized bone (osteoid). Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data; subjects with nonmissing results (n=10).
    Units: percentage of osteoid volume
        arithmetic mean (standard deviation)
    26.12 ( 12.357 ) -
    Serum Phosphorus
    Units: mg/dL
        arithmetic mean (standard deviation)
    2.24 ( 0.396 ) -
    Osteoid Thickness (O.Th)
    Mean thickness, given in micrometers, for osteoid seams. Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data (n=11).
    Units: μm
        arithmetic mean (standard deviation)
    17.21 ( 4.105 ) -
    Osteoid Surface/Bone Surface (OS/ BS)
    Percent of bone surface covered in osteoid. Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data (n=11).
    Units: percentage of osteoid surface
        arithmetic mean (standard deviation)
    91.73 ( 3.438 ) -
    Mineralization Lag Time (MLt)
    Average time interval between osteoid formation and its subsequent mineralization; calculated by dividing the osteoid thickness by the adjusted apposition rate (O.Th/Aj.AR). Aj.AR; amount of new bone created (bone formation rate over the entire osteoid surface). The imputed result was used for some of the baseline data for MLt. Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data (n=11).
    Units: days
        arithmetic mean (standard deviation)
    1539.81 ( 1587.086 ) -
    Mineral Apposition Rate (MAR)
    Linear rate of new bone deposition; mean distance between the double labels, divided by the time interval between them. Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data (n=11).
    Units: μm/day
        arithmetic mean (standard deviation)
    0.58 ( 0.448 ) -
    Mineralizing Surface/Bone Surface (MS/BS)
    Percent of bone surface that displays a tetracycline label reflecting active mineralization; calculated as the double-labeled surface plus one half of the single-labeled surface and is expressed as a function of total bone surface ([dLS + sLS/2]/BS). It is a measure of the proportion of bone surface upon which new mineralized bone was being deposited during the period of tetracycline labeling. Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data (n=11).
    Units: percentage of mineralizing surface
        arithmetic mean (standard deviation)
    5.99 ( 4.763 ) -
    Bone Formation Rate/Bone Surface (BFR/BS)
    Amount of new bone formed in unit time per unit of bone surface; calculated by multiplying MS/BS by the MAR (see previous measure descriptions for MS/BS and MAR definitions). Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data; subjects with nonmissing results (n=6).
    Units: μm^3/μm^2/ year
        arithmetic mean (standard deviation)
    26.68 ( 19.480 ) -
    Bone Formation Rate/Osteoblast Surface (BFR/OS)
    Bone formation rate to osteoid surface ratio, related to the adjusted apposition rate (Aj.AR; amount of new bone created [bone formation rate over the entire osteoid surface]). Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data; subjects with nonmissing results (n=4).
    Units: μm^3/μm^2/ year
        arithmetic mean (standard deviation)
    2309.00 ( 2941.970 ) -
    Bone Formation Rate/Bone Volume (BFR/BV)
    BFR/BV is equivalent to bone turnover rate. Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data; subjects with nonmissing results (n=6).
    Units: percent/year
        arithmetic mean (standard deviation)
    38.33 ( 37.173 ) -
    1,25(OH) 2D
    Full Analysis Set: enrolled and dosed subjects with a baseline measurement (n=12).
    Units: pg/mL
        arithmetic mean (standard deviation)
    37.25 ( 11.686 ) -
    24-Hour Urinary Phosphorus
    Full Analysis Set: enrolled and dosed subjects with a baseline measurement (n=12).
    Units: g/24hr
        arithmetic mean (standard deviation)
    0.82 ( 0.237 ) -
    Ratio of Renal Tubular Maximum Reabsorption Rate of Phosphate to Glomerular Filtration Rate(TmP/GFR)
    Units: mg/dL
        arithmetic mean (standard deviation)
    1.87 ( 0.307 ) -
    Tubular Reabsorption of Phosphate (TRP)
    Units: fraction of phosphorus reabsorbed
        arithmetic mean (standard deviation)
    0.84 ( 0.048 ) -
    Procollagen Type 1 N-Propeptide (P1NP)
    Units: ng/mL
        arithmetic mean (standard deviation)
    77.00 ( 33.273 ) -
    Carboxy-Terminal Cross-Linked Telopeptide of Type I Collagen (CTx-I)
    Units: pg/mL
        arithmetic mean (standard deviation)
    646.93 ( 401.641 ) -
    Bone-Specific Alkaline Phosphatase (BALP)
    Units: μg/L
        arithmetic mean (standard deviation)
    20.43 ( 9.288 ) -
    Mineralizing Surface/ OsteoidSurface (MS/OS)
    Primary Analysis Set: enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data; subjects with nonmissing results (n=11).
    Units: percentage of mineralizing surface
        arithmetic mean (standard deviation)
    6.47 ( 5.120 ) -

    End points

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    End points reporting groups
    Reporting group title
    Open-Label Burosumab Q4W
    Reporting group description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.
    Reporting group title
    Open-Label Burosumab Q4W
    Reporting group description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.
    Reporting group title
    Open-Label Burosumab Q4W
    Reporting group description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.

    Subject analysis set title
    Primary Analysis Set
    Subject analysis set type
    Full analysis
    Subject analysis set description
    Enrolled subjects with baseline and follow-up (Week 48/end of treatment) bone biopsy data.

    Subject analysis set title
    Full Analysis Set
    Subject analysis set type
    Full analysis
    Subject analysis set description
    All enrolled subjects who receive at least one dose of study drug.

    Primary: Percent Change From Baseline in OV/BV at Week 48

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    End point title
    Percent Change From Baseline in OV/BV at Week 48 [1]
    End point description
    OV/BV: percent of a given volume of bone tissue that consists of unmineralized bone (osteoid).
    End point type
    Primary
    End point timeframe
    Baseline, 48 weeks
    Notes
    [1] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point.
    Justification: Statistical analyses are provided in the pdf attachment (data could not be entered due to system limitations).
    End point values
    Primary Analysis Set
    Number of subjects analysed
    10 [2]
    Units: percentage change of unmineralized bone
        arithmetic mean (standard deviation)
    -54.18 ( 20.211 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline in OV_BV at Week 48.docx)
    Notes
    [2] - subjects with non-missing results
    No statistical analyses for this end point

    Secondary: Percentage of Participants Achieving Mean Serum Phosphorus Levels Above the Lower Limit of Normal (LLN) at the Mid-Point of the Dose Interval, as Averaged Across Dose Cycles Between Baseline and Week 24

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    End point title
    Percentage of Participants Achieving Mean Serum Phosphorus Levels Above the Lower Limit of Normal (LLN) at the Mid-Point of the Dose Interval, as Averaged Across Dose Cycles Between Baseline and Week 24
    End point description
    The LLN was defined as 2.5 mg/dL (0.81 mmol/L). The 95% confidence interval (CI) was calculated using Wilson score method.
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: percentage of subjects
        number (confidence interval 95%)
    92.9 (68.5 to 98.7)
    Attachments
    Untitled (Filename: Percentage of Participants Achieving Mean Serum Phosphorus Levels Above the LLN at the Midpoint.docx)
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline in O.Th at Week 48

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    End point title
    Percent Change From Baseline in O.Th at Week 48
    End point description
    O.Th: mean thickness, given in micrometers, for osteoid seams.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    11
    Units: percentage change in thickness
        arithmetic mean (standard deviation)
    -32.21 ( 11.966 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline in O.Th at Week 48.docx)
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline in OS/BS at Week 48

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    End point title
    Percent Change From Baseline in OS/BS at Week 48
    End point description
    OS/Bs: percent of bone surface covered in osteoid.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    11 [3]
    Units: percent change of bone surface covered
        arithmetic mean (standard deviation)
    -26.00 ( 15.012 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline in OS_BS at Week 48.docx)
    Notes
    [3] - subjects with non-missing results
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline in MLt at Week 48

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    End point title
    Percent Change From Baseline in MLt at Week 48
    End point description
    MLt: average time interval between osteoid formation and its subsequent mineralization; calculated by dividing the osteoid thickness by the adjusted apposition rate (O.Th/Aj.AR). Aj.AR; amount of new bone created (bone formation rate over the entire osteoid surface). Based on imputed MLt values.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    10 [4]
    Units: percent change in average time interval
        arithmetic mean (standard deviation)
    -52.24 ( 58.487 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline in MLt at Week 48.docx)
    Notes
    [4] - subjects who had non-missing results
    No statistical analyses for this end point

    Secondary: Change From Baseline in MAR at Week 48

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    End point title
    Change From Baseline in MAR at Week 48
    End point description
    MAR: linear rate of new bone deposition; mean distance between the double labels, divided by the time interval between them.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    11
    Units: μm/day
        arithmetic mean (standard deviation)
    0.04 ( 0.506 )
    No statistical analyses for this end point

    Secondary: Change From Baseline in MS/BS at Week 48

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    End point title
    Change From Baseline in MS/BS at Week 48
    End point description
    MS/BS: percent of bone surface that displays a tetracycline label reflecting active mineralization; calculated as the double-labeled surface plus one half of the single-labeled surface and is expressed as a function of total bone surface ([dLS + sLS/2]/BS). It is a measure of the proportion of bone surface upon which new mineralized bone was being deposited during the period of tetracycline labeling.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    10 [5]
    Units: percent of mineralizing surface
        arithmetic mean (standard deviation)
    1.32 ( 4.365 )
    Notes
    [5] - subjects who had non-missing data
    No statistical analyses for this end point

    Secondary: Change From Baseline in BFR/BS at Week 48

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    End point title
    Change From Baseline in BFR/BS at Week 48
    End point description
    BFR/BS: amount of new bone formed in unit time per unit of bone surface; calculated by multiplying MS/BS by the MAR. MS/BS: percent of bone surface that displays a tetracycline label reflecting active mineralization; calculated as the double-labeled surface plus one half of the single-labeled surface and is expressed as a function of total bone surface ([dLS + sLS/2]/BS). It is a measure of the proportion of bone surface upon which new mineralized bone was being deposited during the period of tetracycline labeling. MAR: linear rate of new bone deposition; mean distance between the double labels, divided by the time interval between them.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    6 [6]
    Units: μm^3/μm^2/year
        arithmetic mean (standard deviation)
    -4.90 ( 27.356 )
    Notes
    [6] - subjects with non-missing results.
    No statistical analyses for this end point

    Secondary: Change From Baseline in BFR/OS at Week 48

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    End point title
    Change From Baseline in BFR/OS at Week 48
    End point description
    BFR/OS: bone formation rate to osteoid surface ratio, related to the Aj.AR (amount of new bone created [bone formation rate over the entire osteoid surface]).
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    4 [7]
    Units: μm^3/μm^2/year
        arithmetic mean (standard deviation)
    -1557.25 ( 3139.075 )
    Notes
    [7] - subjects with non-missing results
    No statistical analyses for this end point

    Secondary: Change From Baseline in BFR/BV at Week 48

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    End point title
    Change From Baseline in BFR/BV at Week 48
    End point description
    BFR/BV: equivalent to bone turnover rate.
    End point type
    Secondary
    End point timeframe
    Baseline, 48 weeks
    End point values
    Primary Analysis Set
    Number of subjects analysed
    6 [8]
    Units: percentage of bone turnover/year
        arithmetic mean (standard deviation)
    -13.50 ( 32.904 )
    Notes
    [8] - subjects with non-missing results
    No statistical analyses for this end point

    Secondary: Percentage of Participants Achieving Mean Serum Phosphorus Levels Above the LLN at the End of the Dosing Cycle Between Baseline and Week 24

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    End point title
    Percentage of Participants Achieving Mean Serum Phosphorus Levels Above the LLN at the End of the Dosing Cycle Between Baseline and Week 24
    End point description
    The LLN was defined as 2.5 mg/dL (0.81 mmol/L). The 95% CI was calculated using Wilson score method.
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: percentage of subjects
        number (confidence interval 95%)
    78.6 (52.4 to 92.4)
    No statistical analyses for this end point

    Secondary: Mean Change of Serum Phosphorus Levels at the Mid-Point of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24

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    End point title
    Mean Change of Serum Phosphorus Levels at the Mid-Point of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: mg/dL
        arithmetic mean (standard deviation)
    1.07 ( 0.300 )
    No statistical analyses for this end point

    Secondary: Percent Change of Serum Phosphorus Levels at the Mid-Point of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24

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    End point title
    Percent Change of Serum Phosphorus Levels at the Mid-Point of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: percent change of serum phosphorus level
        arithmetic mean (standard deviation)
    50.39 ( 19.942 )
    No statistical analyses for this end point

    Secondary: Mean Change of Serum Phosphorus Levels at the End of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24

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    End point title
    Mean Change of Serum Phosphorus Levels at the End of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: mg/dL
        arithmetic mean (standard deviation)
    0.46 ( 0.303 )
    No statistical analyses for this end point

    Secondary: Percentage Change of Serum Phosphorus Levels at the End of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24

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    End point title
    Percentage Change of Serum Phosphorus Levels at the End of Dosing Cycle, as Averaged Across Dose Cycles Between Baseline and Week 24
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: percent change of serum phosphorus level
        arithmetic mean (standard deviation)
    23.32 ( 19.836 )
    No statistical analyses for this end point

    Secondary: Time-Adjusted Area Under the Curve (AUC) of Serum Phosphorus Between Baseline and Week 24

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    End point title
    Time-Adjusted Area Under the Curve (AUC) of Serum Phosphorus Between Baseline and Week 24
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, up to 24 weeks
    End point values
    Full Analysis Set
    Number of subjects analysed
    14
    Units: mg/dL
        arithmetic mean (standard deviation)
    3.023 ( 0.2716 )
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in Serum 1,25(OH)2D

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    End point title
    Change From Baseline Over Time in Serum 1,25(OH)2D
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, Week 1, Week 2, Week 4, Week 20, Week 21, Week 22, Week 24, Week 48, Week 60, Week 70, Week 72, Week 84, Week 94, Week 96Week 108, Week 120, Week 132
    End point values
    Full Analysis Set
    Number of subjects analysed
    12 [9]
    Units: pg/mL
    least squares mean (standard error)
        Week 1; n=12
    107.75 ( 15.964 )
        Week 2; n=12
    48.41 ( 7.397 )
        Week 4; n=12
    13.58 ( 3.435 )
        Week 20; n=12
    -1.34 ( 3.617 )
        Week 21; n=12
    31.75 ( 5.233 )
        Week 22; n=11
    11.50 ( 4.060 )
        Week 24; n=8
    -3.04 ( 4.891 )
        Week 48; n=11
    -1.72 ( 4.190 )
        Week 60; n=11
    -5.73 ( 3.395 )
        Week 70; n=11
    3.36 ( 3.987 )
        Week 72; n=11
    -5.55 ( 2.895 )
        Week 84; n=11
    -5.55 ( 2.962 )
        Week 94; n=11
    9.63 ( 4.239 )
        Week 96; n=11
    -6.09 ( 2.403 )
        Week 108; n=7
    0.02 ( 4.714 )
        Wek 120; n=2
    1.45 ( 4.197 )
        Week 132; n=1
    -1.69 ( 1.993 )
    Attachments
    Untitled (Filename: Statistical Analysis Change From Baseline Over Time in Serum 1,25(OH)2D.docx)
    Notes
    [9] - subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in 24-Hour Urinary Phosphorus

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    End point title
    Change From Baseline Over Time in 24-Hour Urinary Phosphorus
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 36, Week 48, Week 72, Week 96, End of Study II (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    12 [10]
    Units: g/24 hours
    least squares mean (standard error)
        Week 12; n=11
    0.10 ( 0.128 )
        Week 24; n=12
    -0.04 ( 0.075 )
        Week 36; n=12
    -0.01 ( 0.059 )
        Week 48; n=11
    -0.04 ( 0.076 )
        Week 72; n=11
    0.00 ( 0.096 )
        Week 96; n=9
    -0.13 ( 0.082 )
        EOSII; n=5
    -0.07 ( 0.171 )
    Attachments
    Untitled (Filename: Statistical Analysis Change From Baseline Over Time in 24-Hour Urinary Phosphorus.docx)
    Notes
    [10] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in TmP/GFR

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    End point title
    Change From Baseline Over Time in TmP/GFR
    End point description
    TmP/GFR: ratio of renal tubular maximum reabsorption rate of phosphate to glomerular filtration rate.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 2, Week 4, Week 12, Week 22, Week 24, Week 48, Week 60, Week 72, Week 84, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    13 [11]
    Units: mg/dL
    least squares mean (standard error)
        Week 2; n=13
    1.76 ( 0.136 )
        Week 4; n=13
    0.78 ( 0.097 )
        Week 12; n=13
    0.58 ( 0.122 )
        Week 22; n=13
    0.87 ( 0.064 )
        Week 24; n=13
    0.44 ( 0.101 )
        Week 48; n=13
    0.20 ( 0.097 )
        Week 60; n=13
    0.30 ( 0.171 )
        Week 72; n=12
    0.28 ( 0.127 )
        Week 84; n=13
    0.39 ( 0.136 )
        Week 96; n=13
    0.29 ( 0.097 )
        EOSII; n=8
    0.21 ( 0.068 )
    Attachments
    Untitled (Filename: Statistical Analysis Change From Baseline Over Time in TmP_GFR.docx)
    Notes
    [11] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in TRP

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    End point title
    Change From Baseline Over Time in TRP
    End point description
    TRP: tubular reabsorption of phosphate.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 2, Week 4, Week 12, Week 22, Week 24, Week 48, Week 60, Week 72, Week 84, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    14 [12]
    Units: fraction of phosphorus reabsorbed
    least squares mean (standard error)
        Week 2; n=14
    0.07 ( 0.005 )
        Week 4; n=14
    0.03 ( 0.013 )
        Week 12; n=13
    0.01 ( 0.013 )
        Week 22; n=12
    0.04 ( 0.007 )
        Week 24; n=14
    0.01 ( 0.015 )
        Week 48; n=13
    -0.00 ( 0.021 )
        Week 60; n=13
    0.03 ( 0.016 )
        Week 72; n=13
    -0.02 ( 0.035 )
        Week 84; n=13
    0.02 ( 0.019 )
        Week 96; n=13
    0.02 ( 0.014 )
        EOSII; n=8
    0.01 ( 0.011 )
    Attachments
    Untitled (Filename: Statistical Anaysis Change From Baseline Over Time in TRP.docx)
    Notes
    [12] - n=subjects with an assessment at given time point
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in P1NP

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    End point title
    Change From Baseline Over Time in P1NP
    End point description
    P1NP: procollagen type 1 N-propeptide.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 48, Week 72, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    14 [13]
    Units: ng/mL
    least squares mean (standard error)
        Week 12; n=13
    99.18 ( 11.403 )
        Week 24; n=14
    104.33 ( 11.153 )
        Week 48; n=13
    52.49 ( 11.554 )
        Week 72; n=13
    37.29 ( 12.294 )
        Week 96; n=13
    29.29 ( 13.321 )
        EOSII; n=8
    2.14 ( 10.105 )
    Attachments
    Untitled (Filename: Statistical Analysis Change From Baseline Over Time in P1NP.docx)
    Notes
    [13] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline Over Time in P1NP

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    End point title
    Percent Change From Baseline Over Time in P1NP
    End point description
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 48, Week 72, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    14 [14]
    Units: percent change in P1NP
    least squares mean (standard error)
        Week 12; n=13
    133.08 ( 13.680 )
        Week 24; n=14
    137.80 ( 15.741 )
        Week 48; n=14
    76.86 ( 14.114 )
        Week 72; n=13
    50.46 ( 13.659 )
        Week 96; n=13
    41.36 ( 11.566 )
        EOSII; n=8
    26.20 ( 9.919 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline Over Time in P1NP.docx)
    Notes
    [14] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in CTx

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    End point title
    Change From Baseline Over Time in CTx
    End point description
    CTx: carboxy-terminal cross-linked telopeptide of type I collagen.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 48, Week 72, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    14 [15]
    Units: pg/mL
    least squares mean (standard error)
        Week 12; n=14
    464.84 ( 61.696 )
        Week 24; n=14
    404.13 ( 55.948 )
        Week 48; n=13
    175.13 ( 44.022 )
        Week 72; n=13
    143.11 ( 92.503 )
        Week 96; n=13
    76.80 ( 57.357 )
        EOSII; n=8
    -41.32 ( 83.144 )
    Attachments
    Untitled (Filename: Statistical Analysis Change From Baseline Over Time in CTx.docx)
    Notes
    [15] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline Over Time in CTx

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    End point title
    Percent Change From Baseline Over Time in CTx
    End point description
    CTx: carboxy-terminal cross-linked telopeptide of type I collagen.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 48, Week 72, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    14 [16]
    Units: percent change in CTx
    least squares mean (standard error)
        Week 12; n=14
    89.68 ( 13.316 )
        Week 24; n=14
    70.17 ( 10.341 )
        Week 48; n=13
    35.86 ( 7.396 )
        Week 72; n=13
    34.00 ( 14.016 )
        Week 96; n=13
    25.86 ( 8.461 )
        EOSII; n=8
    17.88 ( 9.284 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline Over Time in CTx.docx)
    Notes
    [16] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Change From Baseline Over Time in BALP

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    End point title
    Change From Baseline Over Time in BALP
    End point description
    BALP: bone-specific alkaline phosphatase.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 48, Week 72, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    13 [17]
    Units: μg/L
    least squares mean (standard error)
        Week 12; n=13
    10.93 ( 3.547 )
        Week 24; n=13
    5.82 ( 2.980 )
        Week 48; n=13
    4.50 ( 3.990 )
        Week 72; n=12
    3.13 ( 2.435 )
        Week 96; n=16
    1.14 ( 2.028 )
        EOSII; n=8
    -5.80 ( 3.396 )
    Notes
    [17] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Secondary: Percent Change From Baseline Over Time in BALP

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    End point title
    Percent Change From Baseline Over Time in BALP
    End point description
    BALP: bone-specific alkaline phosphatase.
    End point type
    Secondary
    End point timeframe
    Baseline, Week 12, Week 24, Week 48, Week 72, Week 96, EOSII (up to Week 141)
    End point values
    Full Analysis Set
    Number of subjects analysed
    13 [18]
    Units: percent change in BALP
    least squares mean (standard error)
        Week 12; n=13
    52.54 ( 15.999 )
        Week 24; n=24
    31.37 ( 11.808 )
        Week 48; n=13
    24.35 ( 17.630 )
        Week 72; n=12
    15.13 ( 13.431 )
        Week 96; n=13
    6.92 ( 10.387 )
        EOSII; n=8
    -27.30 ( 12.767 )
    Attachments
    Untitled (Filename: Statistical Analysis Percent Change From Baseline Over Time in BALP.docx)
    Notes
    [18] - n=subjects with non-missing results at given time point
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    Week 0 to EOSII (up to Week 141). Mean (SE) duration of exposure to study drug was 716 (35.1) days
    Adverse event reporting additional description
    Treatment-emergent adverse events are presented.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    18.1
    Reporting groups
    Reporting group title
    Burosumab
    Reporting group description
    1.0 mg/kg burosumab monthly (Q4W), calculated based on baseline weight and up to a maximum dose of 90 mg.

    Serious adverse events
    Burosumab
    Total subjects affected by serious adverse events
         subjects affected / exposed
    4 / 14 (28.57%)
         number of deaths (all causes)
    0
         number of deaths resulting from adverse events
    Injury, poisoning and procedural complications
    Splenic Rupture
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Cardiac disorders
    Atrial Fibrillation
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Nervous system disorders
    Migraine
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Paraesthesia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Gastrointestinal disorders
    Obstruction Gastric
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    Burosumab
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    14 / 14 (100.00%)
    Vascular disorders
    Hot Flush
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Hypertension
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    General disorders and administration site conditions
    Application Site Rash
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Asthenia
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Chest Discomfort
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Chest Pain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Drug Withdrawal Syndrome
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Fatigue
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    4
    Influenza Like Illness
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    4
    Injection Site Bruising
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Injection Site Pain
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Injection Site Pruritus
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Injection Site Reaction
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    16
    Injection Site Urticaria
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    3
    Local Swelling
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Nodule
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Non-Cardiac Chest Pain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Oedema Peripheral
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Pain
         subjects affected / exposed
    5 / 14 (35.71%)
         occurrences all number
    5
    Peripheral Swelling
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Pyrexia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    3
    Immune system disorders
    Drug Hypersensitivity
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Seasonal Allergy
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Reproductive system and breast disorders
    Dysmenorrhoea
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Ovarian Cyst
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Uterine Haemorrhage
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Respiratory, thoracic and mediastinal disorders
    Cough
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    6
    Nasal Congestion
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    5
    Oropharyngeal Pain
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    6
    Productive Cough
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Respiratory Tract Congestion
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Sinus Congestion
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    4
    Sinus Perforation
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Psychiatric disorders
    Anxiety
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    5
    Confusional State
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Depression
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Depressive Symptom
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Insomnia
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    5
    Irritability
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Nightmare
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Investigations
    Blood 25-Hydroxycholecalciferol Decreased
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Blood Calcium Decreased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Blood Cholesterol Increased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Blood Glucose Increased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Blood Pressure Increased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Blood Parathyroid Hormone Increased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Blood Testosterone Decreased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Blood Uric Acid Increased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Ejection Fraction Decreased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Eosinophil Count Increased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Ultrasound Kidney Abnormal
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Vitamin D Decreased
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Injury, poisoning and procedural complications
    Concussion
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Contusion
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Fall
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    6
    Incision Site Pruritus
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Injection Related Reaction
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Ligament Sprain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Post Procedural Swelling
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Procedural Pain
         subjects affected / exposed
    7 / 14 (50.00%)
         occurrences all number
    10
    Stress Fracture
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Sunburn
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Tooth Fracture
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Tooth Injury
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Cardiac disorders
    Bradycardia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Pericarditis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Nervous system disorders
    Amnesia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Dizziness
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    3
    Dysaesthesia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Headache
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    4
    Hypoaesthesia
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    5
    Migraine
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    3
    Motor Dysfunction
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Nerve Compression
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Neuralgia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Paraesthesia
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    4
    Restless Legs Syndrome
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Sciatica
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Somnolence
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Syncope
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Tremor
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Ear and labyrinth disorders
    Hypoacusis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Gastrointestinal disorders
    Abdominal Discomfort
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Abdominal Distension
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Abdominal Pain
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    6
    Abdominal Pain Upper
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    4
    Constipation
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    7
    Diarrhoea
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Dyspepsia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Gastrooesophageal Reflux Disease
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Gingival Pain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Gingival Swelling
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Irritable Bowel Syndrome
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Mouth Ulceration
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    3
    Nausea
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Oral Pain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Periodontal Disease
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Toothache
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    5
    Vomiting
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Vomiting Projectile
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Hepatobiliary disorders
    Hepatic Steatosis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Skin and subcutaneous tissue disorders
    Dermatitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Eczema
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Hyperhidrosis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Pruritus Generalised
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    3
    Rash
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Skin Irritation
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Urticaria
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Xanthoma
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Renal and urinary disorders
    Glycosuria
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Urinary Retention
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Musculoskeletal and connective tissue disorders
    Arthralgia
         subjects affected / exposed
    5 / 14 (35.71%)
         occurrences all number
    17
    Arthritis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Back Pain
         subjects affected / exposed
    6 / 14 (42.86%)
         occurrences all number
    7
    Bone Pain
         subjects affected / exposed
    3 / 14 (21.43%)
         occurrences all number
    5
    Fibromyalgia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Joint Instability
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Joint Swelling
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Limb Discomfort
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Muscle Atrophy
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Muscle Spasms
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    8
    Muscular Weakness
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Musculoskeletal Chest Pain
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Musculoskeletal Pain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Musculoskeletal Stiffness
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Neck Pain
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Osteoarthritis
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    4
    Pain In Extremity
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    6
    Pain In Jaw
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Spinal Pain
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Tendonitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Infections and infestations
    Bronchitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Conjunctivitis Bacterial
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Gingival Abscess
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Gingivitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Hordeolum
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Influenza
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    4
    Laryngitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Lice Infestation
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Lung Infection
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Nasopharyngitis
         subjects affected / exposed
    4 / 14 (28.57%)
         occurrences all number
    8
    Periodontitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Pharyngitis
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Pharyngitis Streptococcal
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Postoperative Wound Infection
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Respiratory Tract Infection Viral
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Root Canal Infection
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Tooth Abscess
         subjects affected / exposed
    7 / 14 (50.00%)
         occurrences all number
    10
    Sinusitis
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    4
    Tooth Infection
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Upper Respiratory Tract Infection
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3
    Urinary Tract Infection
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    2
    Vulvovaginal Mycotic Infection
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    2
    Metabolism and nutrition disorders
    Hyperuricaemia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Hypocalcaemia
         subjects affected / exposed
    1 / 14 (7.14%)
         occurrences all number
    1
    Vitamin D Deficiency
         subjects affected / exposed
    2 / 14 (14.29%)
         occurrences all number
    3

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    29 Mar 2016
    • Sample Size: The sample size was increased from approximately 10 subjects to approximately 14 subjects. A provision was also added that at least 3 subjects from each sex were to be enrolled. • Study Population: Several changes were made to the inclusion and exclusion criteria (Section 7.3.1) as indicated below: - Inclusion criterion #1 was modified to change the age of eligibility to 18 to 65, inclusive. Previously the age was 25 to 65. - Inclusion criterion #5 was modified to correct a duplicative value of 60 mL/min. The eGFR was to be ≥ 60 mL/min (using the CKD- EPI equation); OR eGFR of 45 to < 60 mL/min at Screening with confirmation that the renal insufficiency was not due to nephrocalcinosis. - Inclusion criterion #6 was updated to add informed consent language for minors enrolled in the study. - Inclusion criterion #9 was updated as follows (bolded text indicates newly added text): “Participants of child‐bearing potential or with partners of child-bearing potential who have not undergone a total hysterectomy or bilateral salpingo oophorectomy and are sexually active must consent to use two effective methods of contraception as determined by the site investigator (ie, oral hormonal contraceptives, patch hormonal contraceptives, vaginal ring, intrauterine device, physical double-barrier methods, surgical hysterectomy, vasectomy, tubal ligation, or true abstinence) from the period following the signing of the informed consent through 12 weeks after last dose of study drug.” - Exclusion criterion #4 was modified to remove “oral” and restrict use of any bisphosphonates in the 2 years prior to Screening. - Additional criteria were inserted to exclude individuals who have used denosumab in the 6 months prior to Screening and teriparatide in the 2 months prior to Screening. These medications were also added to the list of prohibited medications for consistency.
    29 Mar 2016
    (continued) - Exclusion criterion #9 (previously #7) was modified to state that patients with serum iPTH ≥2.5 times the upper limit of normal (ULN) will be excluded. Previously this value was serum iPTH ≥1.5 times ULN. - An addition was made to exclusion criterion #19 to state that patients with a history or allergic reaction or adverse reaction tetracycline or demeclocycline will be excluded. - A provision was added to Exclusion criterion #21 to allow individuals to participate who may had a history of recurrent dental abscesses, which are known to be associated with XLH. • Schedule of Events: The schedule of events was updated to add that serum 1,25(OH)2D would be assayed at Week 24. In addition, post-baseline serum FGF23 assessments were only at Weeks 24 and 48, instead of previously scheduled for Weeks 4, 22, 24, 36, and 48. • Investigational Product: Section 7.4.1 was modified to provide additional flexibility in SC dosing sites; subjects could receive study drug via SC injection to the abdomen, upper arms or thighs. • Study Procedures and Assessments: Section 7.5 and Section 7.5.1.1 were clarified to indicate that tetracycline or demeclocycline could be used for labeling for bone biopsy. In addition, the timing of the tetracycline labeling was clarified: The bone biopsy was performed 5 days after the last dosing day for tetracycline or demeclocycline. The first dose was given on days -20 (20 days prior to Baseline Visit), -19, and -18, and the second dose given on days -8, -7, and 6.
    29 Mar 2016
    (continued) • General Assessments: Section 7.5.3 was modified to add that additional genetic testing for mutations in genes consistent with syndromes with clinical and biochemical phenotypic overlap with XLH could be performed if the initial PHEX mutation analysis result was negative or inconclusive and informed consent was provided by the subject. This testing included, but was not necessarily limited to, genes for Autosomal Dominant Hypophosphatemic Rickets (FGF23), Autosomal Recessive Hypophosphatemic Rickets (DMP1, ENPP1), X-Linked Recessive Hypophosphatemic Rickets (CLCN5), and Hereditary Hypophosphatemic Rickets with Hypercalciuria (SLC34A3). • Safety Assessments: Several changes were made to the safety assessments. • a. Blood pressure (Section 7.5.3.2) was obtained twice (2 measurements separated by 15 minutes) at indicted clinic visits. • b. Section 7.5.3.6 was updated to indicate echocardiograms (ECHO) would no longer be read locally at the study site. All ECHO assessments were centrally read. • c. Section 7.5.3.8 (Table 7.5.3.8.1) was updated to add assessment of lipase in all subjects. • Ethics: Section 8.1.2 was updated to state that both the sponsor and investigator would make every effort to assure the study described in this protocol was conducted in full conformance with those principles, current FDA regulations, ICH Good Clinical Practices (GCP) guidelines, and local ethical and regulatory requirements. • Record Retention: Section 8.4.3 was updated to state that all study records must be retained for at least 25 years after the end of the clinical trial or in accordance with national law. • Safety Contact Information: The medical monitor information for this study was updated in Section 8.5.4.7.
    07 Oct 2016
    • Overall Study Design: A 48-week Treatment Extension Period was added to the study design. The corresponding Schedule of Events for this period is provided in Table 2.3. • Primary Analysis: Section 7.6.4.1 was narrowed to focus on osteoid volume (osteoid volume/bone volume, OV/BV) as the primary efficacy endpoint. The other histomorphometric parameters were specified as secondary endpoints under Section 7.6.4.2. • Contraception Methods: The list of examples of highly effective contraception methods was updated in Section 7.5.3.9. • Schedule of Events: The frequency of pregnancy testing in females with child bearing potential was increased to every 4 weeks. • End of Study: Section 7.4.3.1 was updated to clarify that the End of Study is the last subject’s Safety Follow-up Phone Call (12 weeks (± 5 days) after the Final Dose). • Exploratory Endpoints: In Section 7.6.4.4, language describing the exploratory endpoint of pseudofracture healing was modified to read: Healing of pre-existing pseudofractures and/or Looser zones, as defined by skeletal survey at baseline and subsequent targeted radiography. Previously this endpoint had indicated “time to healing” of pre-existing pseudofractures and/or Looser zones. An additional change was made in Section 7.6.4.4 to clarify that the endpoints for Brief Fatigue Inventory (BFI) will be based on BFI question 3-Worst Fatigue, and a BFI Global Fatigue score calculated by averaging all 9 items on the BFI, rather than separate BFI Severity and BFI Interference scores. • Study Objectives: In Section 6, the Pharmacokinetics Objective has been clarified as: Assess the PK of burosumab throughout the dosing cycle following the first doses and at steady state. It had previously stated, “…following single and multiple doses.”
    07 Oct 2016
    • Genetic Testing: In Section 7.5.3, one gene, for Raine Syndrome (FAM20C), has been added to the list of genes that may be assessed for mutation in subjects whose initial PHEX mutation analysis is negative or inconclusive and who provide informed consent. The wording “not necessarily limited to” regarding the list of genes has been removed.
    29 Aug 2017
    • Study Design and Duration: In Sections 7.1 and 7.4.3.1, a second Treatment Extension Period II that included an approximately 45 additional weeks of burosumab treatment, until end of September 2018, was added for subjects enrolled at sites in the US only. The maximum study duration was changed approximately 149 weeks. • Safety Monitoring: In Section 8.5.4.1, Safety Follow-up telephone calls (TCs) over an interval of up to 8 weeks following the End of Study or Early Termination Visit were added for subjects not immediately continuing burosumab treatment under commercial use or another mechanism upon completion of study drug treatment or early withdrawal from this study. Section 7.6.7 and Section 8.5.4.6 were updated to describe safety monitoring during the Treatment Extension Periods I and II of the study. The DMC monitored safety through Week 48. During the Treatment Extension Periods I and II, safety was monitored on an ongoing basis by the Study Safety Review Team (SSRT), an internal safety review team defined and in place since the original protocol. • Exploratory Efficacy Endpoint: In Section7.6.4.4, the exploratory endpoint of healing of pre-existing pseudofractures and/or Looser zones was updated to clarify that it comprises the following components: - the number of active pseudofractures and/or fractures as defined by skeletal survey at baseline and the numbers and percentages of the baseline active pseudofractures/fractures that were healed, partially healed, unchanged, and worsened at post-baseline visits - the number of subjects with baseline active pseudofractures and/or fractures at baseline and the numbers of those subjects who had changes from baseline to healed, partially healed, unchanged, and worsened at post-baseline visits. This was done to reflect the exploratory efficacy endpoints planned for analysis in this study.

    Interruptions (globally)

    Were there any global interruptions to the trial? No

    Limitations and caveats

    Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data.
    None reported
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