Eladocagene exuparvovec

Unassigned

New Medicines

Upstaza · Aromatic L-amino acid decarboxylase (AADC) deficiency

Information

Upstaza
Advanced therapy medicinal product (ATMP)
PTC Therapeutics
PTC Therapeutics

Development and Regulatory status

None
Phase II Clinical Trials
Phase II Clinical Trials
Yes
Yes
Oct 19 · PTC Therapeutics started preparing a license application for the treatment of AADC deficiency for submission to the US FDA in the fourth quarter of 2019 [5]
Aug 19 · PTC are preparing for US filing of eladocagene exuparvovec, and have leased a new site to support AADC gene therapy production. They will work on release of the first commercial batch and anticipate FDA submission with the completion of manufacturing this year [4].
Jan 19 · Company plans to file in EU & US in H2 19 [3].
Jan 19 · Has Rare Paediatric Disease designation in the US [3].
Jan 19 · Has orphan drug status in EU & US [3].
Dec 18 · Based on FDA input and feedback from EMA, PTC Therapeutics does not deem necessary and do not plan to conduct a PIII trial for eladocagene exuparvovec for the treatment of AADC deficiency [3].

Category

Gene therapy correcting the DDC gene defect resulting in a sustained increase in production of AADC in target areas of the CNS thus increasing the production of critical neurotransmitters
A very rare, severe, genetic neurometabolic disorder associated with clinical manifestations related to underproduction of serotonin and dopamine, mainly hypotonia, hypokinesia, ptosis oculogyric crises, and signs of autonomic dysfunction. Prevalence is <1 in 1 million [1].
Aromatic L-amino acid decarboxylase (AADC) deficiency
Intracerebral

Trial or other data

Dec 19 · No UK trial sites [6]
Oct 19 · Combined results from 18 patients with severe AADC deficiency ranging from 21 months to 8.5 years of age, each of whom received a single administration of AGIL-AADC at a dose of 1.8x10e11 vg total delivered to the putamen. At baseline, patients had no functional movement and failed to achieve any motor milestones, including head control, sitting or standing capabilities. Compared to baseline at one-year and at five-years after AGIL-AADC administration, patients had objective evidence of de novo dopamine production as visualized by F-DOPA PET imaging of the brain, consistent with successful and stable DDC gene transduction over time. After administration of AGIL-AADC, the combined group of patients showed significant change from baseline capabilities at one-year post-treatment in functional motor skills assessed with the Peabody Developmental Motor Scale, Second Edition (PDMS-2) total score (p<0.00001) as well as locomotion, grasping, visual-motor integration and stationary subscales (all p<0.00001). Similar changes from baseline at one-year post-treatment were also observed for the combined group of patients on the Alberta Infant Motor Scale (AIMS) total score (p<0.0001) and prone, supine and sit subscales (all p<0.0001) and the stand subscale (p=0.003). Patients showed statistically significant improvements at both two- and five-years post-treatment in achievement of motor milestones of full head control (p<0.0001 at two and five years), sitting unassisted (p=0.0004 at two years; p<0.0001 at five years) and standing with support (p=0.005 at five years), reinforcing the clinical benefit and sustainability of functional motor improvements. The PDMS-2 and AIMS are validated scales used to assess motor skills in young children [5].
Dec 16 · PI/II study (NCT01395641) completes [3].
Sep 16 · PII expansion trial, to extend the eladocagene exuparvovec gene therapy to children with AADC deficiency, who were not enrolled into the previous PI/II trial starts (NTUH-AADC-011; NCT02926066). The open-label trial will enrol approximately 10 patients of 2-6 years of age, in Taiwan [3].
Oct 14 · PI/II study to evaluate the safety and efficacy of eladocagene exuparvovec gene therapy in patients with AADC deficiency starts (NCT01395641; NTUH-AADC010). Ten patients aged at least 24 months will be enrolled in Taiwan. Primary outcome measures are measurable neurotransmitter metabolite HVA or HIAA levels in CSF one year after gene therapy, and increase of PDMS-II score more than 10 points one year after gene therapy. Collection of these data is due to complete Dec 20 [2].