Audentes Therapeutics (BOLD) Announces Positive AT132 Trial Data
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Over the weekend, Audentes Therapeutics, Inc. (Nasdaq: BOLD) announced new positive data from ASPIRO, the clinical trial evaluating AT132 in patients with X-Linked Myotubular Myopathy (XLMTM). The data are being presented today at the 24th International Annual Congress of the World Muscle Society by Dr. James J. Dowling, Hospital for Sick Children, Toronto, Canada, during the Clinical Trial Highlights 7 session scheduled to begin at 1:00pm Central European Summer Time (CEST)/7:00am Eastern Time (ET).
"The new ASPIRO data shared today builds upon the encouraging efficacy and safety profile seen to date with AT132,” stated Dr. Dowling. “Treated patients across both dose cohorts show significant reductions in ventilator dependence and the progressive attainment of developmental motor milestones, suggesting that AT132 has the potential to deliver transformative benefit to patients and families living with XLMTM.”
“We remain focused on our goal of rapidly progressing AT132 toward global regulatory approvals,” stated Natalie Holles, President and Chief Operating Officer of Audentes. “Importantly, we have fully enrolled 14 patients into the ASPIRO dose escalation cohorts, and plan to complete enrollment of the ASPIRO pivotal expansion cohort imminently. We remain on track to submit a BLA in the United States in mid-2020 and a MAA in Europe in the second half of 2020.”
The newly reported data include safety and efficacy assessments as of the August 7, 2019 data cut-off date for 12 patients enrolled in the ASPIRO dose escalation cohorts. The data includes 48 weeks or more of follow-up for seven patients enrolled in Cohort 1 (1x1014 vector genomes per kilogram (vg/kg); six treated and one untreated control) and 24-48 weeks of follow-up for five patients in Cohort 2 (3x1014 vg/kg; four treated and one untreated control). Key assessments include neuromuscular function as assessed by the achievement of motor milestones and improvement in CHOP INTEND score, and respiratory function as assessed by reduction in ventilator dependence and improvement in maximal inspiratory pressure (MIP). Today’s presentation does not include new muscle biopsy data.
Patients receiving AT132 have achieved significant and durable reductions in ventilator dependence, an endpoint considered to be closely correlated with morbidity and mortality in XLMTM patients. To date, the first seven patients treated (all six treated patients in Cohort 1 and the first patient treated in Cohort 2) have achieved ventilator independence. All treated patients continue to show gains in neuromuscular function, with the first seven patients treated achieving the ability to rise to a standing position, or walk.
AT132 has been generally well-tolerated and has shown a manageable safety profile across both dose groups. Since the last data update in May 2019, there has been one new serious adverse event (SAE) in Cohort 2, an episode of joint swelling that resolved without treatment. Results to date indicate no clinically meaningful differences in the safety and tolerability profile of AT132 between the 1x1014 vg/kg and 3x1014 vg/kg dose cohorts.
Next steps in the AT132 development program include the completion of enrollment and follow-up of patients in the ASPIRO pivotal expansion cohort, designed to confirm the safety and efficacy profile of AT132 at a dose of 3x1014 vg/kg, and preparations for filing of a Biologics License Application (BLA) for AT132 in the United States planned in mid-2020 and filing of a Marketing Authorization Application (MAA) in Europe planned for the second half of 2020.
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