David Lebwohl
Analyst · Jefferies. Please, go ahead
Thank you, John. I'll start with a bit of background on ATTR amyloidosis and our approach with 2001. The ATTR amyloidosis is a rare, progressive and fatal disease caused by the buildup of TTR proteins in multiple organs. People living with the disease can have either the hereditary or wild-type form, resulting in a diverse range of disease manifestation, the most frequent being, polyneuropathy and cardiomyopathy. Our lead candidate, 2001, is the first systemically delivered CRISPR-based therapy, dosed in the patient and a potentially curative state treatment for ATTR amyloidosis. 2001 applies our in vivo LNP delivery technology to knock out the TTR gene in the liver, which is the source of circulating TTR protein, therefore permanently reducing amyloid deposition after a single dose. Although the current standard of care has achieved meaningful therapeutic impact with roughly 80% knockdown of serum TTR, there remains unmet medical need in this population. Moreover, as Dr. Gilmore shared at our June Investor event, beyond the benefits of a one-time treatment as demonstrated in ATTR amyloidosis as well as other types of amyloidosis, greater TTR knockdown is anticipated to improve clinical outcomes. We therefore believe a single-dose therapy that most importantly produces greater and durable TTR reduction will offer a significant benefit to patients and value to our healthcare system over the current standard of care. The 2021 Peripheral Nerve Society's Annual Meeting and concurrently published in The New England Journal of Medicine, we shared positive interim data from a Phase 1 study evaluating 21 inpatients living with hereditary ATTR amyloidosis with polyneuropathy that support this hypothesis. Data representing six patients from the first two dose cohorts of Part 1 of the study, the single ascending dose portion were highly encouraging, showing that 2001 induced a dose-dependent reduction in serum TTR. In our second dose level, 0.3 milligrams per kilogram, we achieved an average TTR reduction of 87% at day 28, reaching a maximum TTR reduction of 96. 2001 was generally well-tolerated at both doses with adverse events all being grade one and mostly unrelated to the treatment. Altogether, the data suggests that we can achieve targeted in vivo editings for the desired pharmacological effect, supporting 2001 as a first-in-class single-dose treatment for ATTR amyloidosis, validating our LNP technology and unlocking treatment of diseases that originate in the liver. In terms of next steps for this program, we are continuing enrollment in the dose escalation portion of the Phase 1 study. We plan to provide additional data from Part 1 of the study at a scientific or medical conference later this year, including additional durability data beyond 28 days from the initial cohort. For Cohort 3, each subject will receive a single dose of 2001 at 1 milligram per kilogram. For Cohort 4, we have flexibility in the protocol to proceed to a higher dose or exploring intermediate dose. Once we identify the recommended dose, we plan to initiate Part 2 of the trial, a single-dose expansion cohort. In this portion of the study, eight patients will be administered the recommended dose identified in Part 1 with the objective to further characterize the activity of 2001, including an initial assessment on clinical measures of neuropathy and neurologic function. We expect to advance into Part 2 of the study later this year. In addition, we plan to engage with regulators, including the FDA to move into later phase clinical trials in which we aim to include both patients with polyneuropathy and cardiomyopathy. While we recognize these are interim Phase 1 results, with much more to learn, observations so far are quite meaningful, offering support that substantially derisks our in vivo efforts. We look forward to keeping you updated on our progress. With that, I will now turn over the call to our Chief Scientific Officer, Laura Sepp-Lorenzino to provide updates on our two additional development candidate: 2002 and 5001, and across our R&D effort.