A Phase I/II, Open-label, Dose Escalating With 48 Week Treatment Study to Assess the Safety and Tolerability, Pharmacokinetics, Pharmacodynamics and Efficacy of BMN053 (Previously Known as PRO053) in Subjects With Duchenne Muscular Dystrophy.

Status: Terminated
Location: See all (6) locations...
Intervention Type: Drug
Study Type: Interventional
Study Phase: Phase 1/Phase 2

The purpose of the study is to see whether BMN053 is safe and effective to use as medication for Duchenne muscular dystrophy (DMD) patients with a mutation around location 53 in the DNA for the dystrophin protein.

Participation Requirements
Sex: Male
Minimum Age: 5
Maximum Age: 18
Healthy Volunteers: No

• Duchenne muscular dystrophy resulting from a mutation correctable by treatment with BMN053 confirmed by a state-of-the-art DNA diagnostic technique covering all DMD gene exons, including but not limited to MLPA (Multiplex Ligation-dependent Probe Amplification), CGH (Comparative Genomic Hybridisation), SCAIP (Single Condition Amplification/Internal Primer) or HRMCA (High-Resolution Melting Curve Analysis).

• Ambulant boys aged at least 5 years on the day of first dosing able to walk for at least 300 metres in the 6 minute walking distance (6MWD) test. In addition, results of the 6MWD test must be within ±30 metres of each other at 2 of 3 pre-treatment visits (screen 1, 2 and baseline) prior to first BMN053 administration.

• Adequate quality for biopsy (confirmed with MRI) of the lateral head of the gastrocnemius muscle. Only under exceptional circumstances will an alternative muscle (preferably brachii) be considered for biopsy and only following discussion between the Principal Investigator and the BioMarin Medical Monitor.

• Life expectancy of at least 3 years after inclusion in the study.

• Glucocorticosteroid use which is stable for at least 3 months prior to first BMN053 administration. Subjects must have been receiving glucocorticosteroids for at least 6 months prior to the first BMN053 administration.

• Willing and able to adhere to the study visit schedule and other protocol requirements.

• Written informed consent signed (by parent(s)/legal guardian and/or the subject, according to the local regulations).

• In France, a subject will be eligible for inclusion in this study only if either affiliated to, or a beneficiary of, a social security category.

• Anticipated adequate vein access for intravenous (IV) infusion.

Other Locations
UZ Leuven, Campus Gasthuisberg
Institut de Myologie
Policlinico Universitario Agostino Gemelli
Leids Universitair Medisch Centrum
United Kingdom
Great Ormond Street Hospital for Children
Institute of Genetic Medicine International Centre for Life
Time Frame
Start Date: June 2013
Completion Date: August 3, 2016
Target number of participants: 9
Experimental: Dose escalation phase
In the dose-escalation phase, following screening assessment, two cohorts of three subjects each receive two single doses of BMN 053 in two study periods (i.e., four single doses in total per subject). In each study period they will receive BMN 053 by IV infusion and by SC injection (separated by one week). The proposed doses are 1 mg/kg (Cohort 1, study period 1), 3 mg/kg (Cohort 2, study period 1), 6 mg/kg (Cohort 1, study period 2) and 9 mg/kg (Cohort 2, study period 2). The actual doses may be amended or repeated based on emerging data from previous doses.
Experimental: Regimen selection
After completion of the dose-escalation period of Cohort 1, the safety data of the subjects will be reviewed by a DSMB and if no safety concerns these subjects will continue to receive 6 mg/kg BMN053 weekly by SC injection for 48 weeks. 3 more treatment-naïve subjects will be entered into this Group. These 6 subjects will form Group 1 of the Regimen Selection phase who received 6 mg/kg SC. At the time of this amendment (4) this part of the study has been completed. Following completion of the dose-escalation study period of Cohort 2 (9 mg/kg), the planned review of the preliminary plasma PK data from the dose-escalation phase showed a relative bioavailability of 50% for BMN053 with SC dosing (50% lower plasma AUC after SC dosing compared to IV dosing). Taking into consideration the risk of injection site reactions noted with similar compounds when administered SC over longer term, the planned 9 mg/kg BMN053 weekly by SC injection will be discontinued to be replaced by an IV regimen.
Experimental: 48-week Treatment Phase
Thirty additional treatment-naïve subjects will be recruited for the primary evaluation and will receive treatment at the recommended regimen for a total of 48 weeks. Subjects dosed initially in the dose escalation phase and/or the regimen selection phase of the study will not be included in the primary analysis.~Following completion of the 2nd study period for Cohort 2, the safety data will be reviewed by the DSMB and in the absence of safety concerns the subjects may enter the 48 week treatment phase and receive 9 mg/kg PRO053 once weekly by SC injection. Three new subjects will enter cohort 2 (i.e. 6 subjects in total at this dose level).~After the initial 12 subjects have completed 12 weeks of dosing the dose for the Treatment group (30 new subjects) will be selected based on the totality of the 12-week data from those initial 12 subjects. The initial 12 subjects will also be dosed on the selected dose (i.e. continue on their dose or [down-]titrate).
Experimental: Dosing extension
All subjects who have completed the dose escalation and regimen selection phase of the study (N=15), and subjects who have complete the treatment phase of the study who have tolerated the treatment will be offered to continue dosing in the dosing extension with ongoing assessment of efficacy, safety, and tolerability of BMN 053. Safety, efficacy, PK/PD and biomarker assessments will be performed at scheduled visits; adverse events (AEs) and concomitant medications and therapies will be continuously monitored. The dose extension phase will provide BMN 053 treatment for 48 weeks.
Leads: BioMarin Pharmaceutical

This content was sourced from clinicaltrials.gov

Similar Clinical Trials