Dan Gold
Analyst · Stifel. Your line is now open
Thanks Brian and thank you all for joining us bright and early this morning. I’d like to spend a few minutes highlighting some important advancements we’ve made with our programs over the last few months. Let’s begin with pracinostat, our most advanced drug candidate, now partnered with Helsinn. In July, after months of diligent preparation and site recruitment, the first patient was dosed in the highly anticipated Phase 3 study of pracinostat in combination with azacitidine in adults with newly diagnosed acute myeloid leukemia who are unfit to receive intensive induction chemotherapy. This pivotal double blinded placebo controlled study will enroll approximately 500 eligible patients worldwide. The primary endpoint of this study is overall survival. We believe it is a well powered rigorously designed study and we look forward to tracking its progress in the months ahead. As we have discussed previously, Helsinn is responsible for the conduct and funding of this entire Phase 3 program. Meanwhile, our clinical team here at MEI is actively managing our Phase 2 dose optimization study of pracinostat plus azacitidine in patients with high and very high risk myelodysplastic syndrome who are previously untreated with the hypomethylating agent. Based on our clinical experience with this combination, we believe that a reduced dose of pracinostat has the potential to improve tolerability in patients with higher risk MDS. Our experience suggests that prolonged exposure to this combination may translate to greater efficacy compared to azacitidine alone. The two staged study will be conducted at approximately 25 sites and is expected to enroll upto 120 patients. The first patient was dosed in June. While we are responsible for the conduct of the study, the cost is being shared with Helsinn. We look forward to reporting data from the first stage of this study in the first quarter of 2018. Now, I’d like to turn our attention to our PI3 delta inhibitor, MEI-401, an asset that continues to exceed our high expectations. For those of you less familiar with this space PI3K delta inhibitors have demonstrated clear activity in the treatment of chronic lymphocytic leukemia and follicular lymphoma, but unfortunately at the expense of well-documented toxicities. We believe, this provides an opportunity for a drug that is both effective and safe. ME-401 has several attributes, suggesting it is a highly differentiated PI3K delta inhibitor; attributes that we believe could lead to significant efficacy with diminished toxicity. As we reported back in May, an independent safety review committee completed its review of the first cohort of six evaluable patients ongoing in our Phase 1b dose-escalation study of 401 in relapsed/refractory CLL and follicular lymphoma. The committee found no does limiting toxicities with the response rate well in excess of 50% and declared 60 milligrams daily as a minimal biologic effective dose with a recommendation to escalate to 120 milligrams daily dose cohort. The two months safety and efficacy of this second cohort has recently been reviewed by the safety committee. Seeing no safety concerns and response rate again well in excess of 50%, the committee recommended escalation to a third cohort of 180 milligrams. Meanwhile, the study has enrolled an additional six patients into a 60 milligram expansion cohort, raising the total number of patients to-date to 18. While four patients are still too early for response assessment, all 18 are evaluable for safety, having been on study for a median of nearly three months with a range of 1 to 10 months. Notably, no patients have discontinued to adverse events or disease progression. Grade 3 adverse events associated with ME-401 were reported in two patients, one neutropenia and one rash, neither of which were unexpected. In fact, in both cases, the problem was resolved and both patients continue on study. We are very excited by the response and safety data that continued to emerge from this open label study and await the opportunity to present detailed results in an upcoming scientific meeting. In the meantime, we are now expanding this study to evaluate the combination of ME-401 with an anti-CD20 antibody such as Rituxan. Our goal at this time is to submit a briefing package to the FDA regarding our registrational plan for ME-401 during the first quarter of 2018. For the sake of time, I won’t delve into our clinical stage mitochondrial drug candidate ME-344, except to say that we remain very excited by its prospects and anxiously await the results of the hypothesis testing, randomized study underway in Madrid, evaluating ME-344 in combination with Avastin in women recently diagnosed with HER2-negative breast cancer. With that, I believe, we’re now ready for questions.