Daniel Gold
Analyst · BTIG. Please proceed
Thanks, Brian. And thanks everyone for joining us this afternoon. Over the last year, we've executed on a straightforward purposeful strategy to advance our pipeline of four clinical stage oncology candidates, while building a strong foundation to deliver value to our stakeholders, and importantly, to continue our ultimate mission of delivering patient benefit beyond what is currently achieved through existing therapies. As I go through my prepared remarks, I'll update you on each of our programs, including the upcoming milestones and plans for the next few quarters. Let's start with ME-401 which we believe based on the clinical evidence so far is emerging as the potential best in class PI3 delta inhibitor for the treatment of B-cell malignancies. Please recall that we have two ongoing studies, a Phase 2 clinical trial evaluating patients with relapse to refractory follicular lymphoma intended to support a strategy for an accelerated approval of a marketing application with the FDA, as well as a Phase 1b study that currently is evaluating ME-401 primarily in combination with agents such as Rituxan or zanubrutinib an investigational BTK inhibitor being developed by Beijing. PI3 delta inhibitors are clinically validated for the treatment of B-cell malignancies. This is not surprising given that PI3 delta is found at the crossroads of several B-cell signaling pathways. And as such PI3 delta is a target for treating B-cell disease in general, hold significant potential that matches and I believe may actually exceed the potential of other drug classes targeting these other B-cell pathways, even the BTK inhibitors. However, historically, PI3 delta inhibitor class has been challenged by those limiting toxicities, restricting their clinical utility. This presents an opportunity for the development of a next generation candidate with pharmaceutical properties that can better maximize the biologic potential of PI3 delta inhibition, while limiting toxic studies that hinder their clinical utility. With ME-401, we believe we have the opportunity to open a new chapter in the utility of PI3 delta inhibitors, particularly in combination with other therapies to treat B-cell malignancies. This is in large part because of the unique molecular structure of ME-401 that results in pharmacodynamic characteristics which are distinct from FDA approved delta inhibitors, and others in development. ME-401 is characterized by prolonged target binding, preferential cellular accumulation, significant distribution throughout the body tissues and a 28 hour half-life suitable for once daily oral administration. We believe these attributes are important to the potential differentiation and clinical utility within the class of PI3K inhibitors. Specifically, we believe ME-401's properties allow exploration of flexible dosing regimens, such as in an intermittent dosing schedule, which has the potential to maintain clinical benefit, while minimizing immune related toxicities common to the other PI3 delta agents, either as a monotherapy or in combination with other therapies or investigational agents. On the intermittent schedule ME-401 is administered once daily for two cycles or eight weeks, followed by administration once daily for the first seven days of a 28 day cycle, followed by 21 days of placebo versus the continuous schedule where 401 is administered daily. Based on the maturation of our data today, which now includes over 100 patients treated with ME-401 either on the continuous or intermittent schedules, we believe there's strong evidence for this view of ME-401 as a potentially differentiated next generation PI3 delta inhibitors. Recently, we presented data at the ASCO 2019 and ICML 2019 meetings, demonstrating that follicular and CLL patients on the intermittent schedule achieved an overall response rate similar to that in patients on the continuous schedule, but with nearly a two-thirds reduction in the adverse events of special interest, such as diarrhea and colitis to levels of 10% or less. This highlights the importance of the intermittent dosing schedules a key part of this development program. And we believe a key factor in the emerging clinical profile is observed in the ASCO and ICML data. In this data, we see strong clinical support for the intermittent schedule, consistent with a scientific basis for PI3K delta as an important B-cell target and the rationale for the intermittent dosing schedule that being intermittent schedule provide sufficient delta inhibition in B-cell tumors, while potentially allowing the recovery of T-regulatory cells, the likely catalyst for the adverse events of special interest in the periphery. Based on these data around the beginning of calendar 2019, we initiated a Phase 2 clinical trial evaluating ME-401 as monotherapy for the treatment of adults with relapse to refractory follicular lymphoma after failure of at least two prior systemic therapies, including chemotherapy and anti CD20 antibody. We intend to submit the results to support an accelerated approval of a marketing application with the FDA. We anticipate completing enrollment in this trial sometime around this time next year. The Phase 2 is evaluating both the continuous and intermittent dosing regimens. Approximately 166 patients will be randomized in the trial and the primary efficacy endpoint will be the rate of the objective response to therapy. The Phase 2 study represents an opportunity for an expedited regulatory path to marketing approval for third line follicular lymphoma through the FDA is accelerated approval mechanism. While third line follicular lymphoma represents an important opportunity to meet an unmet medical need and is attracted commercially, we are targeting a broader opportunity. As such in the Phase 1b study, we are continuing to further explore the intermittent schedule as part of a combination approach for the treatment of other B-cell malignancy indications. David Urso, our Chief Operating Officer, who leads our business development efforts will speak to some of our work around these combination treatments with ME-401 since they are related to the expanded opportunity and our strategic partnering activities over the last year and our plans moving forward. And with that, I'll turn it over to David.