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CompletedNCT03423186Updated Nov 19, 2021Results posted

A Study to Assess the Safety and Tolerability of SOBI003 in Pediatric MPS IIIA Patients

A Phase 1/2 interventional study of SOBI003 in Sanfilippo Syndrome Type A (MPS IIIA), sponsored by Swedish Orphan Biovitrum. Completed at 4 sites in 3 countries. Open to participants aged 12 Months to 72 Months. Per ClinicalTrials.gov, last updated 2021-11-19.

Sponsored by Swedish Orphan Biovitrum · Phase 1/2, Interventional, and Treatment

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Phase
Phase 1/2
Study type
Interventional
Enrollment
6
Allocation
Non-randomized
Ages
12 Months to 72 Months
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-13

Among 43 studies in Mucopolysaccharidosis III with a site in United States — 12 open to participants now, 15 under way, 4 of them phase 3. Mucopolysaccharidosis III · United States.

Enrollment
19th of 23
6 · median 17
Started
2018
with 3 others
Phase 1/2
10 of 43
2 open now
Registered
22nd of 43
by date
Lead sponsor
2 of 43
Swedish Orphan Biovitrum

Among the 43 studies in Mucopolysaccharidosis III with a site in United States, this one is the 19th largest by enrollment of the 23 interventional ones that give a count, is one of 4 that started in 2018, is one of 10 in phase 1/2, and was the 22nd registered.

Mucopolysaccharidosis III

58 studies on the registry are indexed under Mucopolysaccharidosis III; 16 are open to participants now.

Browse Mucopolysaccharidosis III studies →

Open to participants now

12 of the 43 studies in Mucopolysaccharidosis III with a site in United States are open now. Recruiting first, the newest first:

7 more — sign in →

All 12 open studies →

A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →

Who these studies take

Of the 8 Mucopolysaccharidosis III studies recruiting now, 5 set no upper age limit and 1 stops at 75 or younger; 7 take children under 18; none take healthy volunteers.

This study: 12 Months to 72 Months · all sexes · no healthy volunteers.

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02

Study summary

MPS IIIA, also known as Sanfilippo A, is an inherited lysosomal storage disease (LSD). MPS IIIA is caused by a deficiency in sulfamidase, one of the enzymes involved in the lysosomal degradation of the glycosaminoglycan (GAG) heparan sulfate (HS). The natural course of MPS IIIA is characterized by devastating neurodegeneration with initially mild somatic involvement. The aims of the present study is to assess the dose related safety, tolerability, pharmacokinetics (PK) and pharmacodynamics (PD) of SOBI003, a chemically modified recombinant human (rh) Sulfamidase developed as an enzyme replacement therapy (ERT).

Read the detailed description

This is an open-label, non-controlled, parallel, sequential ascending multiple-dose, multicenter study to assess the dose related safety, tolerability, PK and PD of SOBI003 in pediatric MPS IIIA patients. Patients between 1 and 6 years of age who have not received previous treatment for MPS IIIA with an ERT, gene- or stem cell therapy will be eligible to participate in the study. The study is planned to consist of 3 dose cohorts, each comprising 3 patients. Treatment initiations will be staggered within each cohort in order to be able to observe, interpret and treat possible adverse reactions. SOBI003 is administered as weekly i.v. infusions over a period of 24 weeks. Upon completion of the 24-week treatment period with satisfactory tolerability, the patient is offered to receive continued SOBI003 treatment by participation in an extension study.

03

Conditions studied

  • Sanfilippo Syndrome Type A (MPS IIIA)
04

Who can participate

Ages eligible
12 Months to 72 Months
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. obtained from the patient's legally authorized representative(s)
  2. Patients with MPS IIIA, as confirmed by both:

    • A documented deficiency in sulfamidase enzyme activity in concordance with a diagnosis of MPS IIIA, and
    • Normal enzyme activity level of at least one other sulfatase measured in leukocytes
  3. Chronological age of ≥12 and ≤72 months (i.e., 1 to 6 years) at the time of the first SOBI003 infusion and a developmental age ≥12 months at screening as assessed by the Vineland Adaptive Behavior Scales, Second Edition (VABS-II)
  4. Medically stable patient who is expected to be able to comply with study procedures

Exclusion criteria

Exclusion Criteria:

  1. At least one S298P mutation in the SGSH gene
  2. for anesthetic procedures, surgical procedure (venous access port) MRI scans and/or lumbar punctures
  3. History of poorly controlled seizures
  4. Patients is currently receiving psychotropic or other medications which in the investigator's opinion, would be likely to substantially confound test results
  5. Significant non-MPS IIIA-related central nervous system (CNS) impairment or behavioral disturbances, which in the investigator's opinion, would confound the scientific integrity or interpretation of study assessments
  6. Prior administration of stem cell or gene therapy, or ERT for MPS IIIA
  7. Concurrent or prior (within 30 days of enrolment into this study) participation in a study involving invasive procedures
Terms in these criteria, in plain language(2)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Contraindication

A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.

05

Study design

Phase
Phase 1 / Phase 2
Primary purpose
Treatment
Allocation
Non-randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
6 participants (actual)

Study arms

  • Experimental
    Dose group 1

    SOBI003 dose 3 mg/kg once weekly for 24 weeks

    Drug: SOBI003

  • Experimental
    Dose group 2

    SOBI003 dose 10 mg/kg once weekly for 24 weeks

    Drug: SOBI003

Interventions

  • DrugSOBI003

    Weekly i.v.infusion

    Also known as: Modified recombinant human sulphamidase

06

What researchers measure

Primary outcomes

  1. Safety as Measured by Adverse Events Frequencies (by Type and Severity)

    Number of adverse events, by type and severity, from start of infusion up to 24 weeks

    Time frame: From start of first infusion up to Week 24

Secondary outcomes

  1. The Observed Serum Concentration Immediately Before the Start of Infusion of SOBI003

    The observed serum concentration immediately before the start of infusion of SOBI003 (CPre-dose).

    Time frame: Weeks 1, 2, 3, 4, 8, 12, and 24

  2. The Observed Serum Concentration at the End of Infusion of SOBI003

    The observed serum concentration at the end of infusion of SOBI003 (CEnd of inf)

    Time frame: Weeks 1, 2, 3, 4, 8, 12, and 24

  3. The Time of the End of the Infusion of SOBI003

    The time of the end of infusion of SOBI003 (tEnd of inf)

    Time frame: Weeks 1, 2, 3, 4, 8, 12, and 24

  4. The Maximum Observed Serum Concentration of SOBI003

    The Maximum Observed Serum Concentration of SOBI003 (Cmax)

    Time frame: 0, 1, 2, 3, 4, 6, 8, 12, 24, 48, 72, 96 hours post-dose on Weeks 1, 4, 12, and 24

  5. The Time at Which the Maximum Serum Concentration of SOBI003 is Observed

    The time after start of infusion at which the maximum serum concentration is observed (tmax)

    Time frame: Weeks 1, 4, 12, and 24

  6. The Minimum Observed Serum Concentration of SOBI003

    The minimum observed serum concentration of SOBI003 (CTrough)

    Time frame: Weeks 1, 4, 12, and 24

  7. Clearance

    Clearance (CL) of SOBI003

    Time frame: Weeks 1, 4, 12, and 24

  8. Area Under the Serum Concentration-time Curve From Time 0 to 168 Hours

    Area under the serum concentration-time curve from time 0 to 168 hours (AUC 0-168h)

    Time frame: 0,1, 2, 3, 4, 6, 8, 12, 24, 48, 72, 96, 120, 144, 168 hours post-dose on Weeks 1, 4,12, and 24

  9. The Half-life

    The half-life of SOBI003 in serum (T1/2)

    Time frame: Weeks 1, 4, 12, and 24

  10. SOBI003 Concentration in Cerebrospinal Fluid

    SOBI003 concentration in cerebrospinal fluid

    Time frame: Weeks 12 and 24

  11. Number of Patients Having Anti-drug Antibodies in Serum

    Number of patients in each dose group having anti-drug antibodies in serum

    Time frame: Weeks 2,4,8,12 and 24

  12. Patients Having Anti-drug Antibodies in Cerebrospinal Fluid

    Percent of patients having anti-drug antibodies in cerebrospinal fluid

    Time frame: Weeks 12 and 24

  13. Change From Baseline in Heparan Sulfate Levels in Cerebrospinal Fluid

    Change from baseline, in percent, of Heparan Sulfate levels in cerebrospinal fluid

    Time frame: Baseline, weeks 12, and 24

  14. Change From Baseline in Heparan Sulfate Levels in Serum

    Change from baseline in Heparan sulfate levels in serum

    Time frame: Weeks 2, 3, 4, 8, 12 and 24

  15. Change From Baseline in Heparan Sulfate Levels in Urine

    Change from baseline in Heparan sulfate levels in urine

    Time frame: Weeks 2, 3, 4, 8, 12 and 24

  16. Change From Baseline in Neurocognitive Development Quotient

    Quotient between age equivalent score and age, 0 - 100%, where high values are desirable. The age equivalent score represent the age of the typical and normal individual who would achieve the same result as the one who was tested. The age equivalent scores are assessed by the Bayley Scales of Infant and Toddler Development®, third edition cognitive subtest or the Kaufman Assessment Battery for Children, Second edition. The Bayley Scales of Infant and Toddler Development-Third Edition is an individually administered test designed to assess developmental functioning of infants and toddlers. The Bayley-III assesses development in five areas: cognitive, language, motor, social-emotional, and adaptive behavior. The Kaufman Assessment Battery for Children (K-ABC) is a clinical instrument for assessing cognitive development.

    Time frame: Week 24

  17. Change From Baseline in Age-equivalence Score

    The age equivalent score represent the age in months of the typical and normal individual who would achieve the same result as the one who was tested. The age equivalent scores are assessed by the Bayley Scales of Infant and Toddler Development®, third edition cognitive subtest or the Kaufman Assessment Battery for Children, Second edition. The Bayley Scales of Infant and Toddler Development-Third Edition is an individually administered test designed to assess developmental functioning of infants and toddlers. The Bayley-III assesses development in five areas: cognitive, language, motor, social-emotional, and adaptive behavior. The Kaufman Assessment Battery for Children (K-ABC) is a clinical instrument for assessing cognitive development.

    Time frame: Week 24

  18. Change From Baseline in Age-equivalence Score as Assessed by VABS-II

    The age equivalent score represent the age in months of the typical and normal individual who would achieve the same result as the one who was tested. The age equivalent scores are assessed by Vineland™ Adaptive Behavior Scales, Expanded Interview Form, Second edition (VABS-II). The Vineland is designed to measure adaptive behavior of individuals from birth to age 90. The Vineland-II contains 5 domains each with 2-3 subdomains. The main domains are: Communication, Daily Living Skills, Socialization, Motor Skills, and Maladaptive Behavior.

    Time frame: Week 24

  19. Change From Baseline in Gray Matter Volume

    Grey matter contains most of the brain's neuronal cell bodies. The grey matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision making, and self-control. The gray matter volume will be measured by volumetric magnetic resonance imaging (MRI).

    Time frame: Week 24

  20. Change From Baseline in Pediatric Quality of Life Inventory (PedsQL™) Total Score

    Pediatric Quality of Life Inventory (PedsQL™) is a modular approach to measuring health-related quality of life (HRQOL) in healthy children and adolescents and those with acute and chronic health conditions. Lower scores indicate better functioning. Min score = 0, and max score = 144.

    Time frame: Week 24

  21. Change From Baseline in PedsQL™ Family Impact Module Total Score

    Pediatric Quality of Life Inventory (PedsQL™) is a modular approach to measuring health-related quality of life in healthy children and adolescents and those with acute and chronic health conditions. The measure includes a scale, from where the categorical score "4", "3", "2", "1", and "0" was reversed and linearly transformed to a 0-100 scale to 4=0, 3=25, 2=50, 1=75 and 0=100, where 100 = minimum and 0 = maximum. The Total Score is the sum of all 36 items in the test divided by the number of items answered. Higher scores indicate better functioning.

    Time frame: Week 24

07

Results

Posted Apr 22, 2021

Participant flow

Participant flow — Overall Study
MilestoneDose Group 1Dose Group 2
Started33
Completed33
Not completed00

Outcome measures

PrimarySafety as Measured by Adverse Events Frequencies (by Type and Severity)

Number of adverse events, by type and severity, from start of infusion up to 24 weeks

Time frame:
From start of first infusion up to Week 24
Reported as:
Number · number of events
Safety as Measured by Adverse Events Frequencies (by Type and Severity)
number of eventsDose Group 1Dose Group 2
Any adverse event53128
Any non-treatment emergent serious adverse event01
Any treatment emergent adverse event (TEAE)53124
Any drug-related TEAE2774
Any non-serious TEAE52121
Any serious TEAE13
Any serious drug-related TEAE00
Any TEAE leading to study and/or treatment withdrawal00
Any drug-related TEAE leading to study and/or treatment withdrawal00
Any serious TEAE leading to study and/or treatment withdrawal00
Any TEAE leading to death00
Any Infusion related Reaction1727
SecondaryThe Observed Serum Concentration Immediately Before the Start of Infusion of SOBI003

The observed serum concentration immediately before the start of infusion of SOBI003 (CPre-dose).

Time frame:
Weeks 1, 2, 3, 4, 8, 12, and 24
Reported as:
Median · ng/mL
The Observed Serum Concentration Immediately Before the Start of Infusion of SOBI003
ng/mLDose Group 1Dose Group 2
Week 1NA (NA to NA)NA (NA to NA)
Week 258.4 (33.0 to 62.2)109.0 (85.7 to 137.0)
Week 368.85 (55.2 to 82.5)135.5 (114.0 to 157.0)
Week 471.4 (NA to 97.7)49.8 (31.4 to 603.0)
Week 8NA (NA to 27.0)25.5 (NA to 51)
Week 1233.75 (26.6 to 40.9)NA (NA to 10.3)
Week 24NA (NA to NA)16.4 (NA to 90.0)
SecondaryThe Observed Serum Concentration at the End of Infusion of SOBI003

The observed serum concentration at the end of infusion of SOBI003 (CEnd of inf)

Time frame:
Weeks 1, 2, 3, 4, 8, 12, and 24
Reported as:
Mean · ng/mL
The Observed Serum Concentration at the End of Infusion of SOBI003
ng/mLDose Group 1Dose Group 2
Week 133800 (29500 to 36400)87500 (75300 to 114000)
Week 234950 (33300 to 36600)108200 (99400 to 117000)
Week 336750 (31300 to 42200)82700 (73300 to 92100)
Week 435700 (16150 to 36600)77400 (71800 to 102000)
Week 820800 (65.5 to 36600)50900 (33300 to 68600)
Week 1230500 (32.5 to 36700)56900 (56100 to 71000)
Week 2417500 (47.5 to 35400)93500 (69700 to 103000)
SecondaryThe Time of the End of the Infusion of SOBI003

The time of the end of infusion of SOBI003 (tEnd of inf)

Time frame:
Weeks 1, 2, 3, 4, 8, 12, and 24
Reported as:
Median · Hours
The Time of the End of the Infusion of SOBI003
HoursDose Group 1Dose Group 2
Week 14.57 (4.27 to 4.62)4.33 (4.02 to 4.33)
Week 24.565 (4.30 to 4.83)4.245 (4.07 to 4.42)
Week 34.28 (4.13 to 4.43)4.1 (3.98 to 4.22)
Week 44.28 (4.05 to 4.50)4.42 (4.27 to 4.90)
Week 84.85 (4.42 to 6.58)8.17 (8.17 to 8.17)
Week 124.23 (4.10 to 6.42)6.83 (5.08 to 7.03)
Week 244.45 (4.08 to 4.53)4.75 (4.47 to 5.57)
SecondaryThe Maximum Observed Serum Concentration of SOBI003

The Maximum Observed Serum Concentration of SOBI003 (Cmax)

Time frame:
0, 1, 2, 3, 4, 6, 8, 12, 24, 48, 72, 96 hours post-dose on Weeks 1, 4, 12, and 24
Reported as:
Median · ng/mL
The Maximum Observed Serum Concentration of SOBI003
ng/mLDose Group 1Dose Group 2
Week 133800 (29500 to 36400)87500 (75300 to 114000)
Week 435700 (16150 to 36600)77400 (71800 to 102000)
Week 1220800 (65.5 to 36400)56900 (56100 to 71000)
Week 2417500 (47.5 to 35400)93500 (69700 to 103000)
SecondaryThe Time at Which the Maximum Serum Concentration of SOBI003 is Observed

The time after start of infusion at which the maximum serum concentration is observed (tmax)

Time frame:
Weeks 1, 4, 12, and 24
Reported as:
Median · Hours
The Time at Which the Maximum Serum Concentration of SOBI003 is Observed
HoursDose Group 1Dose Group 2
Week 14.57 (4.27 to 4.62)4.33 (4.02 to 4.33)
Week 44.28 (4.05 to 4.50)4.42 (4.27 to 4.90)
Week 124.23 (4.10 to 6.42)6.83 (5.08 to 7.03)
Week 244.45 (4.08 to 4.53)4.75 (4.47 to 5.57)
SecondaryThe Minimum Observed Serum Concentration of SOBI003

The minimum observed serum concentration of SOBI003 (CTrough)

Time frame:
Weeks 1, 4, 12, and 24
Reported as:
Median · ng/mL
The Minimum Observed Serum Concentration of SOBI003
ng/mLDose Group 1Dose Group 2
Week 1NA (NA to 2010)NA (NA to NA)
Week 428.9 (NA to 61.3)115 (20.8 to 7730)
Week 1226.2 (17.0 to 32.5)NA (NA to 29.7)
Week 2444.8 (NA to 47.5)NA (14.6 to 9010)
SecondaryClearance

Clearance (CL) of SOBI003

Time frame:
Weeks 1, 4, 12, and 24
Reported as:
Median · (mL/h)/kg
Clearance
(mL/h)/kgDose Group 1Dose Group 2
Week 110.4 (9.7 to 11.1)12.8 (12.0 to 13.6)
Week 48.1 (8.0 to 8.2)12.75 (12.4 to 13.1)
Week 129.5 (7.8 to 11.2)13.45 (12.1 to 14.8)
Week 2419.5 (10.2 to 28.8)10.4 (9.9 to 10.9)
SecondaryArea Under the Serum Concentration-time Curve From Time 0 to 168 Hours

Area under the serum concentration-time curve from time 0 to 168 hours (AUC 0-168h)

Time frame:
0,1, 2, 3, 4, 6, 8, 12, 24, 48, 72, 96, 120, 144, 168 hours post-dose on Weeks 1, 4,12, and 24
Reported as:
Median · h*ng/mL
Area Under the Serum Concentration-time Curve From Time 0 to 168 Hours
h*ng/mLDose Group 1Dose Group 2
Week 1290044.5 (275152 to 304937)834411 (737687 to 2492658)
Week 4369915.5 (365435 to 374396)789106.5 (761760 to 816453)
Week 12324999.5 (267722 to 382277)749864 (674188 to 828540)
Week 24198973 (104009 to 293937)961516.5 (915941 to 1007092)
SecondaryThe Half-life

The half-life of SOBI003 in serum (T1/2)

Time frame:
Weeks 1, 4, 12, and 24
Reported as:
Median · Hours
The Half-life
HoursDose Group 1Dose Group 2
Week 119.8 (5.4 to 34.2)22.75 (5.8 to 39.7)
Week 434.3 (29.7 to 38.9)7.65 (6.3 to 9.0)
Week 1240.95 (34.4 to 47.5)10.75 (8.8 to 12.7)
Week 2420.85 (9.3 to 32.4)15.95 (6.0 to 25.9)
SecondarySOBI003 Concentration in Cerebrospinal Fluid

SOBI003 concentration in cerebrospinal fluid

Time frame:
Weeks 12 and 24
Reported as:
Median · mg/L
SOBI003 Concentration in Cerebrospinal Fluid
mg/LDose Group 1Dose Group 2
Week 12NA (NA to NA)17.8 (17.8 to 17.8)
Week 24NA (NA to NA)47.2 (12.2 to 64.6)
SecondaryNumber of Patients Having Anti-drug Antibodies in Serum

Number of patients in each dose group having anti-drug antibodies in serum

Time frame:
Weeks 2,4,8,12 and 24
Reported as:
Count of participants · Participants
Number of Patients Having Anti-drug Antibodies in Serum
ParticipantsDose Group 1Dose Group 2
Weeks 211
Weeks 423
Weeks 833
Weeks 1233
Weeks 2433
SecondaryPatients Having Anti-drug Antibodies in Cerebrospinal Fluid

Percent of patients having anti-drug antibodies in cerebrospinal fluid

Time frame:
Weeks 12 and 24
Reported as:
Number · percent of participants in dose group
Patients Having Anti-drug Antibodies in Cerebrospinal Fluid
percent of participants in dose groupDose Group 1Dose Group 2
Week 1233.366.7
Week 2466.7100
SecondaryChange From Baseline in Heparan Sulfate Levels in Cerebrospinal Fluid

Change from baseline, in percent, of Heparan Sulfate levels in cerebrospinal fluid

Time frame:
Baseline, weeks 12, and 24
Reported as:
Median · percent change
Change From Baseline in Heparan Sulfate Levels in Cerebrospinal Fluid
percent changeDose Group 1Dose Group 2
Week 12-5.4 (-33.0 to 7.7)-52.8 (-64.6 to -28.4)
Week 24-17.5 (-26.5 to -14.7)-50.9 (-59.4 to -21.2)
SecondaryChange From Baseline in Heparan Sulfate Levels in Serum

Change from baseline in Heparan sulfate levels in serum

Time frame:
Weeks 2, 3, 4, 8, 12 and 24
Reported as:
Median · mg/L
Change From Baseline in Heparan Sulfate Levels in Serum
mg/LDose Group 1Dose Group 2
Week 2-1.8070 (-1.891 to -0.660)-1.7460 (-3.409 to -1.705)
Week 3-1.22 (-2.006 to -0.220)-1.9190 (-3.576 to -1.856)
Week 4-1.9040 (-2.083 to -1.850)-1.9229 (-3.770 to -1.268)
Week 8-2.1030 (-2.210 to -1.615)-1.8290 (-3.730 to -1.772)
Week 12-1.8170 (-2.131 to -1.597)-1.8340 (-3.729 to -1.722)
Week 24-1.7480 (-2.207 to -1.657)-1.8310 (-3.722 to -1.818)
SecondaryChange From Baseline in Heparan Sulfate Levels in Urine

Change from baseline in Heparan sulfate levels in urine

Time frame:
Weeks 2, 3, 4, 8, 12 and 24
Reported as:
Median · g/mol
Change From Baseline in Heparan Sulfate Levels in Urine
g/molDose Group 1Dose Group 2
Weeks 2-456.2 (-496.1 to -298)-561.1 (-592.1 to -231.9)
Weeks 3-494.67 (-592.1 to -390.0)-597.4 (-618.8 to -309.3)
Weeks 4-498.53 (-575.8 to -422.79)-503.465 (-672.17 to -334.76)
Weeks 8-474.7 (-542.22 to -460.95)-666.81 (-672.42 to -341.70)
Weeks 12-534.1 (-540.71 to -442.33)-640.2 (-668.83 to -326.13)
Weeks 24-421.98 (-557.33 to -258.1)-695.9 (-698.03 to -348.05)
SecondaryChange From Baseline in Neurocognitive Development Quotient

Quotient between age equivalent score and age, 0 - 100%, where high values are desirable. The age equivalent score represent the age of the typical and normal individual who would achieve the same result as the one who was tested. The age equivalent scores are assessed by the Bayley Scales of Infant and Toddler Development®, third edition cognitive subtest or the Kaufman Assessment Battery for Children, Second edition. The Bayley Scales of Infant and Toddler Development-Third Edition is an individually administered test designed to assess developmental functioning of infants and toddlers. The Bayley-III assesses development in five areas: cognitive, language, motor, social-emotional, and adaptive behavior. The Kaufman Assessment Battery for Children (K-ABC) is a clinical instrument for assessing cognitive development.

Time frame:
Week 24
Reported as:
Median · unitless
Change From Baseline in Neurocognitive Development Quotient
unitlessDose Group 1Dose Group 2
Change From Baseline in Neurocognitive Development Quotient-8.7 (-11.2 to -4.9)-15.68 (-53.3 to 4.1)
SecondaryChange From Baseline in Age-equivalence Score

The age equivalent score represent the age in months of the typical and normal individual who would achieve the same result as the one who was tested. The age equivalent scores are assessed by the Bayley Scales of Infant and Toddler Development®, third edition cognitive subtest or the Kaufman Assessment Battery for Children, Second edition. The Bayley Scales of Infant and Toddler Development-Third Edition is an individually administered test designed to assess developmental functioning of infants and toddlers. The Bayley-III assesses development in five areas: cognitive, language, motor, social-emotional, and adaptive behavior. The Kaufman Assessment Battery for Children (K-ABC) is a clinical instrument for assessing cognitive development.

Time frame:
Week 24
Reported as:
Median · Months
Change From Baseline in Age-equivalence Score
MonthsDose Group 1Dose Group 2
Change From Baseline in Age-equivalence Score-1.0 (-4 to 1)-3.0 (-6 to 6)
SecondaryChange From Baseline in Age-equivalence Score as Assessed by VABS-II

The age equivalent score represent the age in months of the typical and normal individual who would achieve the same result as the one who was tested. The age equivalent scores are assessed by Vineland™ Adaptive Behavior Scales, Expanded Interview Form, Second edition (VABS-II). The Vineland is designed to measure adaptive behavior of individuals from birth to age 90. The Vineland-II contains 5 domains each with 2-3 subdomains. The main domains are: Communication, Daily Living Skills, Socialization, Motor Skills, and Maladaptive Behavior.

Time frame:
Week 24
Reported as:
Median · Months
Change From Baseline in Age-equivalence Score as Assessed by VABS-II
MonthsDose Group 1Dose Group 2
Change From Baseline in Age-equivalence Score as Assessed by VABS-II1.0 (-9 to 2)0.0 (-3 to 24)
SecondaryChange From Baseline in Gray Matter Volume

Grey matter contains most of the brain's neuronal cell bodies. The grey matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision making, and self-control. The gray matter volume will be measured by volumetric magnetic resonance imaging (MRI).

Time frame:
Week 24
Reported as:
Median · mL
Change From Baseline in Gray Matter Volume
mLDose Group 1Dose Group 2
Change From Baseline in Gray Matter Volume10.858 (-6.22 to 42.27)39.129 (-33.28 to 111.53)
SecondaryChange From Baseline in Pediatric Quality of Life Inventory (PedsQL™) Total Score

Pediatric Quality of Life Inventory (PedsQL™) is a modular approach to measuring health-related quality of life (HRQOL) in healthy children and adolescents and those with acute and chronic health conditions. Lower scores indicate better functioning. Min score = 0, and max score = 144.

Time frame:
Week 24
Reported as:
Mean · Units on a scale
Change From Baseline in Pediatric Quality of Life Inventory (PedsQL™) Total Score
Units on a scaleDose Group 1Dose Group 2
Change From Baseline in Pediatric Quality of Life Inventory (PedsQL™) Total Score-9.3 ± 15.52-7.3 ± 14.9
SecondaryChange From Baseline in PedsQL™ Family Impact Module Total Score

Pediatric Quality of Life Inventory (PedsQL™) is a modular approach to measuring health-related quality of life in healthy children and adolescents and those with acute and chronic health conditions. The measure includes a scale, from where the categorical score "4", "3", "2", "1", and "0" was reversed and linearly transformed to a 0-100 scale to 4=0, 3=25, 2=50, 1=75 and 0=100, where 100 = minimum and 0 = maximum. The Total Score is the sum of all 36 items in the test divided by the number of items answered. Higher scores indicate better functioning.

Time frame:
Week 24
Reported as:
Mean · Units on a scale
Change From Baseline in PedsQL™ Family Impact Module Total Score
Units on a scaleDose Group 1Dose Group 2
Change From Baseline in PedsQL™ Family Impact Module Total Score-9.77 ± 19.051.3 ± 3.11

Adverse events

Collected over The period for recording adverse events, including Serious Adverse Events (SAEs), began upon receiving the first dose of SOBI003 and ended at completion of the week 24 visit. In addition SAEs was reported from the time for signing the informed consent form until 28 days past the last dose of SOBI003.. Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Dose Group 10/3 (0%)1/3 (33.3%)3/3 (100%)
Dose Group 20/3 (0%)1/3 (33.3%)3/3 (100%)
Most frequent serious events
Most frequent serious events
EventDose Group 1Dose Group 2
PyrexiaGeneral disorders1/30/3
Device related infestationsInfections and infestations0/31/3
EndocarditisInfections and infestations0/31/3
PneumoniaInfections and infestations0/31/3
Most frequent other events
Showing 10 of 55
Most frequent other events
EventDose Group 1Dose Group 2
TachycardiaCardiac disorders1/33/3
VomitingGastrointestinal disorders1/33/3
Upper respiratory tract infectionInfections and infestations3/32/3
UrticariaSkin and subcutaneous tissue disorders2/33/3
PyrexiaGeneral disorders0/33/3
Vascular access site occlusionInjury, poisoning and procedural complications1/32/3
TremorNervous system disorders1/32/3
RestlessnessPsychiatric disorders0/32/3
Iron deficiency anaemiaBlood and lymphatic system disorders1/31/3
Medical device site haemorrhageGeneral disorders1/30/3

Baseline characteristics

Age, Continuous
Age, Continuous(months)Dose Group 1Dose Group 2Total
Mean46.3 ± 24.229.0 ± 12.237.7 ± 19.6
Sex: Female, Male
Sex: Female, Male(Participants)Dose Group 1Dose Group 2Total
Female112
Male224
Ethnicity (NIH/OMB)
Ethnicity (NIH/OMB)(Participants)Dose Group 1Dose Group 2Total
Hispanic or Latino000
Not Hispanic or Latino336
Unknown or Not Reported000
Race (NIH/OMB)
Race (NIH/OMB)(Participants)Dose Group 1Dose Group 2Total
American Indian or Alaska Native000
Asian000
Native Hawaiian or Other Pacific Islander000
Black or African American000
White336
More than one race000
Unknown or Not Reported000
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Study locations

4 sites
  • Childrens's Hospital and Research Center
    Oakland, California 94609, United States
  • University of North Carolina Hospitals
    Chapel Hill, North Carolina 27599, United States
  • University Medical Center Hamburg-Eppendorf
    Hamburg, Germany
  • Gazi University Hospital
    Ankara, Turkey
09

References and documents

Publications

  • Harmatz P, Muenzer J, Ezgu F, Dalen P, Huledal G, Lindqvist D, Gelius SS, Wiken M, Onnestam K, Broijersen A. Chemically modified recombinant human sulfamidase (SOBI003) in mucopolysaccharidosis IIIA patients: Results from an open, non-controlled, multicenter study. Mol Genet Metab. 2022 Aug;136(4):249-259. doi: 10.1016/j.ymgme.2022.06.008. Epub 2022 Jun 28. PubMed 35835061 ↗

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

Individual participant data

Plan to share: No — Undecided

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Ran from Jun 2018 to primary completion in Oct 2019, 16 months.

Results were first posted in Apr 2021, 1 year 5 months after primary completion.

How these figures are worked out, and which studies are left out of them.

Registered
Jan 29, 2018
First posted
Feb 6, 2018
StartActual
Jun 19, 2018
Primary completionActual
Oct 25, 2019
CompletionActual
Oct 25, 2019
Results first posted
Apr 22, 2021
Last update
Nov 19, 2021
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Nov 19, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03423186
Responsible party
Sponsor
First posted
Feb 6, 2018
Start date
Jun 19, 2018
Primary completion
Oct 25, 2019
Completion
Oct 25, 2019
Results posted
Apr 22, 2021
Last update
Nov 19, 2021

Study contacts

Paul Harmatz, MD
principal investigator · Childrens's Hospital and Research Center Oakland

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Nov 2021. You cannot join it, but the record below documents what was studied.

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