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A PHASE III STUDY OF JR-141 IN MUCOPOLYSACCHARIDOSIS TYPE II (HUNTER SYNDROME) PATIENTS

Status
Active, not recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2024-512289-33-00
Acronym
JR-141-GS31
Enrollment
35
Registered
2024-08-08
Start date
2022-08-24
Completion date
Unknown
Last updated
2025-11-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hunter Syndrome, Mucopolysaccharidosis type II

Brief summary

Change in the raw scores from baseline to Week 105 measured by the BSID-III (cognitive domain) in Cohort A, Change in levels of CSF HS from baseline to Week 53 in Cohort A

Detailed description

Change in the age equivalent scores measured by the BSID-III (cognitive domain) or KABC-II (NVI) from baseline to Week 105 in Cohort A, Change in the age equivalent scores of adaptive behavior measured by the VABS-II -from baseline to Week 105 in Cohort A, Relative change in liver volume relative to body weight from baseline to Week 53 in Cohort A and Cohort B, Relative change in spleen volume relative to body weight from baseline to Week 53 in Cohort A and Cohort B, Relative change in distance walked using the 6-minute walk test from baseline to Week 53 in Cohort B, Gross and fine motor skills evaluated by age equivalent scores (VABS-II motor skills domain and BSID-III motor domain) from baseline to Week 26, Week 53, Week 78 and Week 105 for Cohort A., Pulmonary assessment by absolute forced vital capacity (FVC) change from baseline to Week 26 and Week 53 in Cohort B., Ongoing assessment of adverse events (AEs)., Periodical assessment of laboratory tests (hematology, blood biochemistry, iron-related tests, and urinalysis); vital signs (pulse rate, body temperature, and blood pressure); 12-lead electrocardiogram (ECG); antibodies (anti-IDS antibodies and anti-JR 141 antibodies), and infusion-associated reactions (IARs), Plasma drug concentration (only in JR-141 groups): Week 1, Week 26, Week 53, and Week 104 for Cohort A and Week 1, Week 26, and Week 52 for Cohort B., Plasma PK parameters (only in JR-141 groups): Week 1, Week 26, Week 53, and Week 104 for Cohort A and Week 1, Week 26, and Week 52 for Cohort B., Drug concentration in CSF of 16 patients in the JR-141 group of Cohort A and Cohort B, at baseline and Week 26., Frequency of treatment-emergent adverse events (TEAEs) including infusion-associated reactions (IARs) over the period of the study., Incidence of clinically significant laboratory tests; vital signs; 12-lead electrocardiogram (ECG); antibodies (anti-IDS antibodies and anti-JR 141 antibodies) over the period of the study.

Interventions

Sponsors

Jcr Pharmaceuticals Co. Ltd.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
0 Years to 64 Years

Design outcomes

Primary

MeasureTime frame
Change in the raw scores from baseline to Week 105 measured by the BSID-III (cognitive domain) in Cohort A, Change in levels of CSF HS from baseline to Week 53 in Cohort A

Secondary

MeasureTime frame
Change in the age equivalent scores measured by the BSID-III (cognitive domain) or KABC-II (NVI) from baseline to Week 105 in Cohort A, Change in the age equivalent scores of adaptive behavior measured by the VABS-II -from baseline to Week 105 in Cohort A, Relative change in liver volume relative to body weight from baseline to Week 53 in Cohort A and Cohort B, Relative change in spleen volume relative to body weight from baseline to Week 53 in Cohort A and Cohort B, Relative change in distance walked using the 6-minute walk test from baseline to Week 53 in Cohort B, Gross and fine motor skills evaluated by age equivalent scores (VABS-II motor skills domain and BSID-III motor domain) from baseline to Week 26, Week 53, Week 78 and Week 105 for Cohort A., Pulmonary assessment by absolute forced vital capacity (FVC) change from baseline to Week 26 and Week 53 in Cohort B., Ongoing assessment of adverse events (AEs)., Periodical assessment of laboratory tests (hematology, blood biochemist

Countries

France, Germany, Italy, Poland, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026