E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
Severe Mucopolysaccharidosis Type I (Hurler syndrome, MPS IH) |
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E.1.1.1 | Medical condition in easily understood language |
MPS IH is an inherited disorder caused by an enzyme deficiency. Complex molecules accumulate in the body, affecting multiple organs and causing skeletal problems and developmental delay. |
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E.1.1.2 | Therapeutic area | Diseases [C] - Congenital, Hereditary, and Neonatal Diseases and Abnormalities [C16] |
MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 18.1 |
E.1.2 | Level | LLT |
E.1.2 | Classification code | 10028094 |
E.1.2 | Term | Mucopolysaccharidosis IH |
E.1.2 | System Organ Class | 100000004850 |
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E.1.3 | Condition being studied is a rare disease | Yes |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
The objective of this trial is to investigate the safety and efficacy of methotrexate as an immune tolerance induction agent in mitigating the alloimmune response to enzyme replacement therapy with laronidase in severe MPS I. |
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E.2.2 | Secondary objectives of the trial |
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E.2.3 | Trial contains a sub-study | No |
E.3 | Principal inclusion criteria |
• Written informed consent of a legally authorised guardian(s) • A diagnosis of MPS I as defined by deficient α-L-iduronidase activity in leukocytes or cultured fibroblasts, in a laboratory accepted by the investigators • Clinical status consistent with severe Hurler phenotype OR If available, mutations consistent with a classical Hurler genotype e.g. homozygosity or compound heterozygosity for nonsense mutations (Q70X, W402X) in IDUA gene • Age ≥3 months and ≤2.5 years at diagnosis • Decision to offer HSCT with an appropriate donor after a short period (minimum 4 weeks) of ERT
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E.4 | Principal exclusion criteria |
• The patient has previously received intravenous laronidase • The patient has undergone haematopoietic stem cell transplantation • The patient has a known primary immune defect • The patient has a known sensitivity or allergy to methotrexate • The patient has known contraindications to receiving methotrexate such as pre-existing hepatic or renal dysfunction, or the patient is receiving concomitant medications that interact with methotrexate • The patient has received any immunomodulatory or immunosuppressive medication within 90 days prior to enrolment • The patient has been exposed to any other investigational product within 90 days prior to enrolment in the trial • The patient has any clinically significant organic disease (with the exception of symptoms relating to MPS I), including cardiovascular, hepatic, pulmonary, neurologic or renal disease, other serious intercurrent illness or extenuating circumstances, that, in the opinion of the investigator would preclude participation in the trial or potentially decrease survival
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E.5 End points |
E.5.1 | Primary end point(s) |
Peak anti-laronidase IgG titre (between 4 weeks post-ERT and pre-HSCT) of <1:4000 |
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
Anti-laronidase IgG samples will be taken at baseline, 4 weeks post-ERT, 8 weeks post-ERT, pre-HSCT and 12 weeks post-HSCT. |
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E.5.2 | Secondary end point(s) |
Secondary endpoints: Safety and toxicity of methotrexate as measured by haematological parameters and biochemical markers of renal and hepatic function. Absolute value of peak anti-laronidase IgG titre (between 4 weeks post-ERT and pre-HSCT).
Tertiary (exploratory only) endpoints: Incidence of neutralising antibodies to laronidase at time of highest anti-laronidase antibody titres Urinary glycosaminoglycans (GAGs), urinary DS/CS ratio and blood heparan/dermatan sulfate derived disaccharides Anti-laronidase IgM titres Immune phenotyping and B/T cell functional studies Sleep oximetry (oxygen desaturation index 4%) Exploratory biomarkers in blood and urine
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
Secondary endpoints: Clinical laboratory tests for haematological parameters and liver and renal function will be taken at baseline, 1, 2, 3, 4, 8 weeks post-ERT, pre-HSCT and 12 weeks post-HSCT. Anti-laronidase IgG samples will be taken at baseline, 4 weeks post-ERT, 8 weeks post-ERT, pre-HSCT and 12 weeks post-HSCT.
Tertiary endpoints: Samples for neutralising antibodies, IgM titres, urine GAGs, urine DS/CS ratio, heparan/dermatan sulfate derived disaccharides and exploratory biomarkers will be collected at baseline, 4 weeks post-ERT, 8 weeks post-ERT, pre-HSCT and 12 weeks post-HSCT Sleep oximetry will be performed at baseline and pre-HSCT Immune phenotyping will be performed at baseline, 1 week post-ERT, 4 weeks post-ERT, 8 weeks post-ERT, pre-HSCT and 12 weeks post-HSCT.
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E.6 and E.7 Scope of the trial |
E.6 | Scope of the trial |
E.6.1 | Diagnosis | No |
E.6.2 | Prophylaxis | No |
E.6.3 | Therapy | Yes |
E.6.4 | Safety | No |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | No |
E.6.7 | Pharmacodynamic | No |
E.6.8 | Bioequivalence | No |
E.6.9 | Dose response | No |
E.6.10 | Pharmacogenetic | No |
E.6.11 | Pharmacogenomic | No |
E.6.12 | Pharmacoeconomic | No |
E.6.13 | Others | No |
E.7 | Trial type and phase |
E.7.1 | Human pharmacology (Phase I) | No |
E.7.1.1 | First administration to humans | No |
E.7.1.2 | Bioequivalence study | No |
E.7.1.3 | Other | No |
E.7.1.3.1 | Other trial type description | |
E.7.2 | Therapeutic exploratory (Phase II) | No |
E.7.3 | Therapeutic confirmatory (Phase III) | Yes |
E.7.4 | Therapeutic use (Phase IV) | No |
E.8 Design of the trial |
E.8.1 | Controlled | No |
E.8.1.1 | Randomised | No |
E.8.1.2 | Open | No |
E.8.1.3 | Single blind | No |
E.8.1.4 | Double blind | No |
E.8.1.5 | Parallel group | No |
E.8.1.6 | Cross over | No |
E.8.1.7 | Other | No |
E.8.2 | Comparator of controlled trial |
E.8.2.1 | Other medicinal product(s) | No |
E.8.2.2 | Placebo | No |
E.8.2.3 | Other | No |
E.8.3 |
The trial involves single site in the Member State concerned
| Yes |
E.8.4 | The trial involves multiple sites in the Member State concerned | No |
E.8.4.1 | Number of sites anticipated in Member State concerned | 1 |
E.8.5 | The trial involves multiple Member States | No |
E.8.6 Trial involving sites outside the EEA |
E.8.6.1 | Trial being conducted both within and outside the EEA | No |
E.8.6.2 | Trial being conducted completely outside of the EEA | No |
E.8.7 | Trial has a data monitoring committee | No |
E.8.8 |
Definition of the end of the trial and justification where it is not the last
visit of the last subject undergoing the trial
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E.8.9 Initial estimate of the duration of the trial |
E.8.9.1 | In the Member State concerned years | 1 |
E.8.9.1 | In the Member State concerned months | 5 |
E.8.9.1 | In the Member State concerned days | 21 |
E.8.9.2 | In all countries concerned by the trial years | 1 |
E.8.9.2 | In all countries concerned by the trial months | 5 |
E.8.9.2 | In all countries concerned by the trial days | 21 |