Conditions: Mucopolysaccharidosis IV A Morquio A Syndrome MPS IVA
Keywords: Mucopolysaccharidosis IV type A MPS IV Type A Mucopolysaccharidosis IVA MPS IVA Morquio A Syndrome Lysosomal Storage Disorder LSD N-acetylgalactosamine-6-sulfatase N-acetylgalactosamine-6-sulfate sulfatase galactose-6-sulfatase GALNS enzyme replacement therapy ERT
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 173
Healthy volunteers: no

Brief summary:
This Phase 3 extension study will evaluate the long-term efficacy and safety of BMN 110 2.0 mg/kg/week and/or BMN 110 2.0 mg/kg/every other week in patients with mucopolysaccharidosis IVA (Morquio A Syndrome).

Detailed description:
This is a multi-center, multinational, extension study to evaluate 2 dose regimens of BMN 110 treatment in patients with MPS IVA who completed MOR-004.

The last study visit assessments for MOR-004 will constitute Baseline for this study. The first study drug dose of this protocol will occur on Week 0 of MOR-005, which is the same as the last visit (Week 24) of MOR-004. Initially, the study will be double-blind with patients previously randomized to BMN 110 in MOR-004 remaining on their assigned BMN 110 dose regimen (qw or qow dosing). The MOR-004 placebo patients will be re-randomized (1:1 ratio) to one of the 2 BMN 110 dose regimen groups: 2.0 mg/kg/qw or 2.0 mg/kg/qow.

There will be two study parts:

* Part 1 - randomized double-blind until the optimal BMN 110 dose regimen has been determined, based on the final primary efficacy analysis from MOR-004
* Part 2 - open-label BMN 110 treatment with the single optimal dose regimen

Arms:
arm 1: BMN 110 Weekly: In Part 1, patients will receive an intravenous infusion of BMN 110 at a dose of 2.0 mg/kg administered over a period of approximately 4 hours once a week. arm 2: BMN 110 Every Other Week: In Part 1, patients will receive an intravenous infusion of BMN 110 at a dose of 2.0 mg/kg administered over a period of approximately 4 hours every other week and will receive infusions of placebo on alternating weeks.

Interventions: intervention 1: BMN 110 - Weekly intervention 2: BMN 110 - Every Other Week
Intervention descriptions: intervention 1: In Part 1, patients will receive intravenous (IV) infusions of study drug at a dose of 2.0 mg/kg/qw administered over a period of approximately 4 hours once a week.

In Part 2, patients will continue to receive 2.0 mg/kg of BMN 110 every week, with no placebo. intervention 2: In Part 1, patients will receive intravenous (IV) infusions of study drug at a dose of 2.0 mg/kg administered over a period of approximately 4 hours every other week. Patients randomized to the 2.0 mg/kg/qow arm will receive infusions of placebo on alternating weeks, to mask active drug weeks.

In Part 2, patients will receive 2.0 mg/kg of BMN 110 every week, with no placebo.

Protocol document: