Joao Siffert
Analyst · Jefferies
Thank you, Greg. Good morning, everyone, and thank you for joining us to review our second quarter 2020 financial results and business highlights. We remain committed to our important mission of working together to deliver gene and cell therapies for people impacted by serious diseases. During the past several months, our team has remained resilient in the face of COVID-19 pandemic and has delivered on our goals in clinical development, manufacturing and regulatory affairs toward bringing urgently needed treatments to patients with recessive dystrophic epidermolysis bullosa or RDEB and Sanfilippo syndrome, also known as MPS III.
I'll start with the update on EB-101, our autologous gene corrected cell therapy for the treatment of RDEB. Patients with RDEB face a lifelong struggle with fragile skin and easily tear -- that easily tears and blisters. Most patients develop large wounds that remain unhealed, often covering a significant proportion of their body and currently relying solely on palliative measures that include very painful and time-consuming and wound care. EB-101 has the potential to be the first approved therapy for RDEB and the only durable treatment to address large chronic wounds, which are the most painful and debilitating and require involved care and affect the majority of the RDEB patients.
We're pleased to report that we resumed study enrollment in our pivotal Phase III called VITAL study in late June, following a pause due to the COVID pandemic. The second patient has since been treated and a third patient is expected to be treated in the coming weeks. Target enrollment for the vital studies is 10 to 15 patients with RDEB, comprising approximately 30 large chronic wound sites treated in total. We continue to work closely with the team at Stanford to prescreen patients and to treat prescreen patients as soon as possible. We currently anticipate completing enrollment in the VITAL study in early 2021, depending on how long the impact of the COVID-19 pandemic lasts, including travel restrictions and concerns about patient and/or staff safety.
Data from the completed Phase I/IIA trial of EB-101 reported to the Society for Pediatric Dermatology or SPD, 45th Annual Meeting in July, provided a detailed analysis of the considerable and durable reduction in wound burden resulting from EB-101 treatment of their large chronic RDEB wounds, lasting 3 to 5 years. Furthermore, wound healing at 50% or greater following EB-101 treatment was associated with no pain at the treated sites at 3, 4 and 5 years post-treatment compared with presence of pain in 53% of wound sites at baseline prior to treatment.
The ongoing VITAL study will further characterize the relationship between reduction of wound burden and pain relief following EB-101 treatment. At SPD, we also presented a poster that provides insights on the significant disease burden of RDEB, highlighting data from a literature review of 65 studies under clinical, humanistic and economic impact on patients living with RDEB and their families. The disease burden and management of RDEB takes an extraordinary toll on quality of life, which underscores the need for therapies that reduce wound burden and the associated humanistic consequences and economic impact.
Now let's turn to our adeno-associated virus, AAV-based investigational gene therapies, ABO-102 and ABO-101 for MPS IIIA and MPS IIIB, respectively. In July, we held a kickoff meeting under the EMA Priority Medicines or PRIME program, which included members of the Committee for Advanced Therapies, or CAT, and the Committee for Medicinal Products for Human Use, CHMP of BMA. At the meeting, we presented our plan toward registration of ABO-102 for MPS IIIA, taking advantage of the PRIME Designation. PRIME is EMA's program to accelerate assessment of promising therapies that demonstrate the potential to address substantial unmet medical need based on early clinical data. Based on the meeting, along with previous input from the CHMP and the pediatric Pediatric Committee, PDCO of BMA, we anticipate submitting a marketing authorization application for EU conditioned approval of ABO-102 for MPS IIIA in 2023.
Regarding the U.S. regulatory path for ABO-102 and MPS IIIA, we're continuing to seek guidance from FDA, we acknowledge that the FDA is currently focused on matters related to COVID-19 and all the life-threatening conditions is reflected in its issued guidance put out in May. We look forward to providing an update after we receive feedback from the FDA.
Let's now move on to patient enrollment in our MPS III Phase I/II trials. Total enrollment to date in the Transpher A study for MPS IIIA 17 patients, including 11 patients dosed in the Cohort 3. Total enrollment to date in the Transpher B study for MPS IIIB is 9 patients, including 2 patients dosed in Cohort 3. We anticipate additional enrollment in the programs in the coming weeks and potentially completing enrollment in both Transpher A and Transpher B studies by the end of 2020. Updated positive interim data from the Transpher A and Transpher B studies was presented at the American Society of Gene & cell Therapy 23rd annual meeting in May. And during the MPS Expert Webinar of International Symposium on MPS and related diseases in July, both these presentations are available on our website.
The finding support previously reported data showing preservation of neurocognitive skills now up to 2 years among the 3 young patients treated in dose Cohort 3 of the Transpher A type. In addition, improvements in multiple disease-specific biomarkers and a safety -- favorable safety profile in MPS IIIA and MPS IIIB patients after treatment with ABO-101 and ABO-102 were observed in both studies.
Turning to our manufacturing facilities. We resume internal operations at our fully integrated quality and manufacturing facility in Cleveland in June. Our manufacturing activity support the increased activity in our clinical programs, including manufacturing EB-101 drug product for the Phase III VITAL study. We also initiated process development that will enable production in-house of the retrovirus used for EB-101 manufacturing manufacturer, providing us with increased control of the supply chain and product quality while reducing costs.
We also resumed process development activities that -- to enable in-house manufacturing of commercial supply of ABO-101 and ABO-102.
We're now on the design stage for additional manufacturing facilities within the existing space to support the advancement of our clinical programs and also commercial manufacturing.
Before I turn the call over to Ed for the final financial review, let me introduce and welcome Michael Amoroso, our new Chief Commercial Officer. Michael joined us in July and brings over 20 years of product commercialization experience in biotechnology and pharmaceutical industries with a focus on cell and gene therapies. Prior to joining Abeona, he held various commercial leadership positions at Kite, Eisai, Celgene and Sanofi. At Kite Michael was responsible for the worldwide commercial organization for the autologous CAR T-cell therapy YESCARTA. His proven track record in commercialization and supply chain management for personalized autologous cell therapies will be incredibly valuable as we plan for a potential go-to-market strategy for EB-101. I'll turn it over to Michael to say a few words. Michael?