Katrine Bosley
Analyst · Cowen & Company. Your line is open
Thanks, Mark. Good afternoon, everybody, and thank you for joining us for our corporate update call for the second quarter. I am joined today by several members of our executive team, including Andrew Hack, our Chief Financial Officer; Vic Myer, our Chief Technology Officer; and Charlie Albright, our Chief Scientific Officer. We made progress on multiple fronts during the second quarter. On our call today, we'll review how we advanced our product pipeline and platform technology, continued to build the business for the long term and strengthened our organization. First, I'd like to discuss our pipeline progress and starting with our lead program in Leber congenital amaurosis type 10 or LCA10. We remain on track to file our IND by mid-2018 for EDIT-101, which is our preclinical product candidate for LCA10. There are a number of points about the program I'd like to highlight as well. We are pleased to announce today that we received institutional review board approval for the first site in our LCA10 clinical natural history study. This is a prospective study that will evaluate patients with LCA10 to assess the course of the disease and it will also assess potential endpoints and aspects of the trial design for interventional clinical studies with EDIT-101 down the road. We anticipate this natural history study will enroll approximately 40 patients, ages three and above at multiple sites in the U.S. and Europe, and will evaluate and follow patients for at least one year. We are currently finalizing logistical details at their clinical trial sites and will then proceed to begin patients' enrollment. In the second quarter, we received advanced therapy medicinal product or ATMP designation from the European Medicines Agency for EDIT-101 as well. The classification is reserved for new potentially revolutionary medicinal products based on genes, cells or tissues, and it's an essential step in commercializing products effectively across the European Union, and it's an important step for this program. As you know, we presented data from a nonhuman primate study in our LCA10 program in May at ASGCT. In this study, we demonstrated efficient editing of the CEP290 gene, which causes LCA10 in the retina of nonhuman primates. We showed that we productively edited 15% of the total CEP290 wheels in nonhuman primate retina, and this translates to a projected 50% editing of the CEP290 wheels in photoreceptors, the target cells in the retina. This significantly exceeds our prespecified therapeutic threshold of 10% editing. We also sought to understand how EDIT-101 performs in mature human photoreceptors. And to do this, we developed a human retinal explant system. And in this system, we obtained human eyes three to five hours postmortem, isolated retinal tissue and exposed the retina to EDIT-101 in tissue culture. After four weeks in culture, we then performed tissue staining and we quantified the editing. That tissue staining showed the Cas9 expression was limited to the photoreceptor layer as we anticipated. We then used our proprietary UDiTas technology to quantify the editing. Similar to our nonhuman primate studies, we measured editing directly in the entire retinal sample and then calculated projected editing in the photoreceptors themselves. Similar to nonhuman primates, photoreceptors represent only about a 0.25% of the cells in human retinal explants, and the EDIT-101 gene-editing machinery is only expressed in photoreceptors. Our preliminary data from these studies showed productive editing as high as 16% across the entire retina, and based on this, we estimate that we productively edited approximately 50% of the CEP290 wheels in mature human photoreceptors. This data is consistent with what we've seen in experimental animals and was recently presented at the Cold Spring Harbor Genome Engineering Conference. In addition to achieving potentially therapeutic levels of editing, we aim to create therapies that minimize risks from off-target editing. Developing and applying robust methods for setting specificity has been a fundamental component of our platform from the very beginning. For this reason, it is encouraging that neither our biased nor our unbiased methodologies have detected any off-target editing in the human genome from EDIT-101. Taken together, these results reinforce our confidence in the therapeutic potential of EDIT-101. Beyond our LCA10 program, we achieved an important technical milestone in our work with Juno Therapeutics. As a reminder, we're working with Juno on three programs combining our genome editing platform with Juno's CAR and TCR technologies to create engineered T-cells to treat cancer. This most recent milestone arises from the program to overcome the tumor microenvironment. Enabled -- enabling T-cells to overcome the tumor microenvironment has the potential to expand the range of cancers that these therapies may be able to address. This program is distinct from the program to improve T cell persistence, in which we previously achieved a technical milestone, and we'll receive a $2.5 million milestone for this achievement from Juno Therapeutics. Over the course of the quarter, we also presented progress in multiple other programs at scientific conferences. In our discovery program to treat sickle cell disease and beta thalassemia, we demonstrated a substantial increase in fetal hemoglobin protein with a novel genome-editing strategy that has the potential to be more potent than the approaches reported by others in the field. We think this data is a promising foundation to advance a best-in-class therapy for these patients. We also reported high-efficiency editing using our proprietary CRISPR Cpf1 system in both human T-cells and adult hematopoietic stem cells. Cpf1 is a new CRISPR genome-editing system that substantially expands the range of genomic sites we can target, and it may also have advantages in terms of specificity, manufacturing and delivery. In addition, Cpf1 may enable us to achieve more efficient gene repair relative to Cas9. It's separate and distinct from Cas9, and is underpinned by completely separate intellectual property, which is exclusively licensed to Editas. We believe the properties of Cpf1 have the potential to expand the reach of our genome-editing medicines even further. Together with our portfolio of multiple Cas9 species and proprietary engineered variance of each, as well as the broad range of propriety platform innovations that we have shown publicly, we believe we have an unparalleled CRISPR platform and product engine, which has the potential to deliver the best and widest range of genome-editing medicines. Overall, this year, we've demonstrated the productivity of our team and platform through more than 20 presentations and posters at a wide range of scientific and medical conferences and across a range of programs and technical advancements. We expect to present additional progress in multiple programs and platform advancements through the remainder of this year. Outside of our progress on advancing our pipeline of CRISPR medicines, we have also further strengthened our business and our organization. We have further matured our intellectual property portfolio with the issuance of the first patent for CRISPR Cpf1, which we have exclusively licensed. As a reminder -- Cpf1 is the only CRISPR system in addition to Cas9 that has been made to work in human cells, and although this is only one of many positive patent developments in the quarter, we thought it was worth specifically calling out because we do anticipate Cpf1 will be an important contributor to our pipeline of products and in the field of genome editing broadly. We continue to further develop our organization by adding key capabilities to our team, including important hires in pharmacology, manufacturing and operations. And we also welcome Andrew Hirsch to our Board of Directors, where in addition to his roll of an independent director, he will serve as the chair of the Audit Committee. He is currently the Chief Financial Officer of Agios Pharmaceuticals. And now, I'd like to hand the call over to Andrew Hack, our Chief Financial Officer, to review the results from the quarter.