Faye Feller
Analyst · B. Riley. Your line is now open
Thank you, Chip, and good afternoon to everyone on the call. We were thrilled and very proud to report positive top line results from our IMerge Phase 3 study of imetelstat in lower-risk MDS in the beginning of January. On our January conference call, we presented detailed efficacy and safety results, which are available on the IR section of our website under Presentation. Today, I will provide a high-level summary of those results, which we believe confirms a positive overall benefit/risk profile for imetelstat. We saw statistically significant and clinically meaningful improvements in the imetelstat-treated patients compared to the placebo control arm. Specifically, the trial met its primary endpoint of 8-week transfusion independence as well as a secondary 24-week TI endpoint. We saw substantial increases in both hemoglobin levels and reductions in transfusions. We also saw efficacy across MDS subtypes, including both RS+ and RS- patients and irrespective of baseline transfusion burden or IPSS risk category. The initial clinical and molecular evidence we reported support imetelstat’s potential for MDS disease modification. And the safety results were consistent with prior imetelstat’s clinical experience. The most frequent adverse events were neutropenia and thrombocytopenia, which were manageable and reversible with the majority being resolved in less than 4 weeks. Importantly, any serious clinical consequences from these cytopenias with imetelstat treatment were observed at low rates and were similar to placebo. We are planning to present and publish additional data and analyses from IMerge throughout 2023 as we have been collaborating with key opinion leaders to prepare these abstracts and discussing the top line results with providers. We have received excellent feedback on the readout as well as acknowledgment on the potential for imetelstat to represent a meaningful treatment advance in lower-risk MDS. Based on these positive top line results from IMerge Phase 3, we continue to execute on our plan to submit an NDA in mid-2023. Since our request for rolling submission was granted, we have submitted the non-clinical module of the NDA this quarter. We remain on track with our plan to submit the remaining modules, including clinical and CMC by mid-year. Also this quarter, we participated in a standard pre-NDA meeting with the FDA. There were no showstoppers at that meeting, nor comments that change our expected timeline or fundamental strategy for the NDA submission. When we submit the NDA, we plan to request priority review as allowed under our Fast Track designation in lower-risk MDS. If granted, we expect FDA approval of the NDA and the U.S. commercial launch of imetelstat in lower-risk MDS could occur as early as the first quarter of 2024. In addition, the MAA submission is planned by the end of 2023. Typically, the review time for an MAA is up to 14 months. Thus, we expect the timing of potential approval of the MAA by the end of 2024. Please note, going forward, we don’t plan to provide any details relating to regulatory interactions, unless they result in a change to our submission strategy or expected timing. Moving on to our second Phase 3 clinical program, let me outline our plans in 2023 for relapsed/refractory MF. IMpactMF is the first and only Phase 3 MF trial with overall survival as the primary endpoint. To trigger the interim analysis for this study, death events need to occur in more than 35% of the total planned enrollment of 320 patients. Thus, the timing of the interim analysis depends on the number of enrolled patients as well as the rate at which death events occur. Potentially, the number of events required to conduct the interim analysis for this study could occur before enrollment is complete as these death events will accrue throughout the enrollment period. Using current planning assumptions around enrollment and median OS estimates for each treatment arm, we expect the interim analysis for IMpactMF to occur in 2024. These analyses are event-driven, and it is uncertain whether actual rates for enrollment and death events will reflect current assumptions. This quarter, we initiated several strategies to increase the rate of site activation and patient enrollment, including recruitment initiatives for patient matching and more engagement with investigators through on-site visits or interactions at medical meetings. We will consider the impact of these initiatives over the next 6 months as well as evaluate the overall rates of enrollment and death events occurring in the study. We expect to provide an update on the projected timing of the interim analysis after that evaluation. If the improvement in OS that was observed in imetelstat-treated patients in our IMbark Phase 2 trial can be confirmed in the Phase 3 IMpactMF trial, and we believe imetelstat will be strongly differentiated from other treatments in MF, currently approved or in development and will likely change the treatment paradigm for relapsed/refractory MF patients. As a hematologist, I know from personal experience that physicians consider OS as the ultimate measure of benefit for the treatment of their cancer patients. We expect OS would be especially relevant in the case of IMpactMF patients who no longer respond to JAK inhibitors and who, due to their current dismal prognosis and limited treatment options are in desperate need for novel therapy. Beyond our Phase 3 trials, we have several additional programs to potentially expand the treatment applications for imetelstat in hematologic malignancies. In May 2022, we started IMproveMF, a Phase 1 study designed to evaluate the safety and clinical activity of imetelstat in combination with ruxolitinib in patients with frontline MF. This study design was informed by data from preclinical studies, describing the sequential treatment of ruxolitinib followed by imetelstat has a selective inhibitory effect on malignant MF stem cells of the sparring normal hematopoietic stem cells. For IMproveMF, we aim to determine the safety profile of the combination regimen of ruxolitinib and imetelstat as well as explore any potential for disease-modifying activity in a frontline MF disease setting, similar to what was observed with imetelstat treatment in the Phase 2 IMbark trial in a relapsed/refractory myelofibrosis patient population. Two of the three trial sites for this study are open for patient enrollment the remaining site is expected to open for enrollment in 2023. We also expect to present preliminary data from this study by the end of 2023. Based on preclinical models showing imetelstat prevented expansion of human AML leukemic stem cells and prolonged survival in stem cells, we are also supporting an investigator-led study in relapsed/refractory AML and higher-risk MDS for patients who are already treated with a hypomethylating agent. As noted on the slide, this study called IMpress, is evaluating imetelstat as a single-agent treatment in this severe disease. The first site is planned to open in 2023. If the initial IMpress data show promise for imetelstat in higher-risk MDS and AML, we expect to support another investigator-led study, evaluating the combination of imetelstat plus other drugs that are part of the standard of care for such patients. Moving on to our preclinical and research programs. This slide provides a snapshot of the status of our lymphoid malignancies and next-generation TI programs. In November 2022, early data was published from the pre-clinical programs in lymphoid malignancies being conducted at MD Anderson Cancer Center. Based on these early results, we are continuing the collaboration to assess the potential therapeutic effect of imetelstat in lymphoid malignancies and expect further data by the end of 2023. The objective of our discovery program is to identify a lead compound as a potential next-generation oral telomerase inhibitor. We continue to investigate various chemical entities as potential scaffolds. We expect completion of the current discovery effort in 2023, upon which we plan to potentially advance any of these compounds into the next step of discovery research. If successful, these efforts would permit initiation of an IND-enabling non-clinical studies in the future. As I hope you can see the positive topline results in lower-risk MDS have provided an impetus for the next step in imetelstat’s development. We believe continued progress in the other areas I described, such as relapsed/refractory MF, frontline MF, higher-risk MDS and AML, lymphoid malignancies and the discovery of potential next-generation telomerase inhibitors, we will explore how imetelstat and telomerase inhibition may provide potential benefit to many more patients. With that, I will turn the call over to Anil to describe the planned activities around potential commercial launch of imetelstat. Anil?