Dr. John Scarlett
Analyst · Charles Duncan from Piper Jaffray. You may begin
Thanks, Olivia. Good afternoon, everyone, and thanks for joining. I'd like to begin today by briefly commenting on the status of IMbark, the Phase 2 trial and intermediate-2 and/or high risk myelofibrosis patients who are refractory too or who have relapsed after treatment with the JAK Inhibitor. First, this trial was ongoing and patients remaining in the treatment phase are continuing to receive imetelstat. All safety and efficacy assessments are being conducted as planned in the current protocol, including for survival. Second, FDA recently requested updated efficacy and safety data including information regarding deaths in order to address the benefit risk profile with imetelstat IMbark and to justify continued treatment of patients in the trial. Janssen has informed us that they have submitted the requested information, including current overall survival data. Pardon me -- related interactions between Janssen and the FDA are ongoing. Third, Janssen has informed us that to-date median overall survival has not yet been reached in the end dosing arm. Therefore, as we announced at the end of July, the timing of the primary analysis for IMbark, which includes an assessment of potential survival benefit will begin upon the earlier of either; first, a pre-specified number of deaths occurring in the trial; or second, the end of third quarter of 2018. After the completion of that IMbark primary analysis, Janssen must make a continuation decision. That is they must notify us whether they elect to maintain the license rates and continue the development of imetelstat in any indication. Assuming that the primary analysis begins at the end of the third quarter of 2018, we expect that the latest time for Janssen continuation decision would be in the fourth quarter of 2018 or the first quarter of 2019. I’d like to next review the newly published data from Part 1 IMerge, which is the ongoing trial of imetelstat in patients with lower risk MDS being conducted by Janssen. These clinical data have been accepted for a poster presentation at the American Society of Hematology or ASH Annual Meeting and were published this morning in an abstract on the ASH website at www.hematology.org. As we described previously, IMerge is in two parts. Part 1 is a Phase 2 open label single arm trial that's been conducted 8 and 32 patients, administrating imetelstat intravenously every four weeks at a dose of 7.5 milligrams per kilogram. Part 2 not yet initiated is designed to be a Phase 3 study that will be conducted after Part 1 is completed and is designed to confirm in a randomizing control trial, the efficacy and safety of imetelstat in the patient population as well as dosing identified in Part 1. In lower risk MDS patients, chronic anemia is predominant clinical problem. Treatment with in erythropoiesis-stimulating agent or an ESA, such as EPO can provide an improvement in the anemia, but the effect is transient. As a result, many patients become dependent on frequent red blood cell transfusions to manage symptoms of anemia and fatigue. Transfusion dependencies associated with poor survival because the toxicity associated iron overload as well as potential infections and allergic reactions. To be enrolled in IMerge, all patients must have relapsed faster or would be refractory treatment within ESA. It's a naive patients were eligible, if their serum EPO level was greater than 500 milliunits per mL because in patients with EPO levels this high, ESA treatment is not effective and they're considered refectory to ESAs. Among the 32 patients enrolled in Part 1 of IMerge, 28 patients or 88% had been previously treated with ESA while 13% or 43% -- sorry 13 patients or 43% had serum EPO greater than 500 milliunits per mL. Patients enrolled in the trial must also be dependent on red cell transfusions requiring at least four units of red blood cells during an eight week period prior to entry into the trial. Among the 32 patients enrolled, red blood cell transfusions dependency was high. The median red blood cell transfusion burdened at entry to the trial with fixed units per eight weeks ranging from 4 to 14 units. The ultimate goal for most trials of investigational agents and lower risks MDS is to enable patients to become transfusion independent for as long as possible. As such, the primary endpoint for both part of IMerge delayed for percentage of patients who achieved red blood cell transfusions independence for at least an eight week consecutive period. This has been a key regulatory endpoint in many disorders associated with anemia and transfusion requirement. Secondary endpoint in IMerge includes the rate of 24 week in transfusion independence and the rate hematologic improvement. Hematologic improvement is the degree to which the frequency of transfusions are reduced and increases in serum hemoglobin levels are absorbed. In addition, various measures and the durability of these transfusions in hematologic responses to imetelstat treatment are also being assessed for IMerge. As cited in the abstract, using the May 2017 data cut off and a medium follow-up with patients 48 weeks, efficacy data for imetelstat noted that 34% of the first 32 patients in Part 1 of IMerge achieve red blood cell transfusion independence lasting for at least eight weeks. Similarly 63% of patients achieved hematologic improvement. The original inclusion and exclusion criteria for IMerge did not restrict the number or type of other prior MDS treatments of patient was allowed to have received before entering the trial, and therefore, there were no restrictions to any particular MDF subtype. Among the first 32 patients enrolled in Part 1, 25% had previously been treated with hypomethylating agents such as azacitidine and decitabine; and 38% with immunomodulatory agents such lenalidomide. Approximately half or 56% of patients have not received either HMA or lenalidomide, also 22% or 7 patients have a del(5q) chromosomal abnormality. Among the 32 patients enrolled in Part 1, a subset of 13 patients have not received prior treatment with either in HMA or lenalidomide, and also did not have a del(5q) chromosomal abnormality. In the U.S., hypomethylating agents or HMAs are approved for the treatment of both lower risk and high risk MDS patients and the immunomodulatory agent lenalidomide is approved for the approximately 15% of lower risk MDS patients, who have a deletion in the short arm of chromosome 5 or so-called del(5q) abnormality. Physicians in the U.S. particularly outside of the main academic centers used both HMAs and lenalidomide broadly in lower risk MDS because there are limited alternative treatment options available. In contrast, in Europe, HMAs are not approved for lower risk MDS, nor lenalidomide approved for non-del(5q) patients. As a consequence, very few if any lower risk European patients are treated with either lenalidomide or HMA at least until they can be characterized as higher risk MDS patients. As cited in the abstract, using the same May 2017 data cut off in a median follow-up of patients of 48 weeks as was reported for the overall population, the 13 patients without del(5q) who are naive to lenalidomide and HMAs showed an increased rate and durability of transfusion independence compared to the overall trial of population. With 54% of the 13 patients have set, achieving red blood cell transfusion independence lasting for at least 8 weeks. Furthermore, 31% of the 13 patients subset achieved red blood cell transfusion independence lasting for at least 24 weeks compared to 16% of the overall trial population. In addition, 69% in the N is equal to 13 patients subset achieved in an rethloid hematologic improvement suggesting some degree of clinical benefit was observed in the majority of the imetelstat treated patients. As noted in the abstract, the safety profile in Part 1 was consistent with prior clinical trials that imetelstat and hematologic malignancies and no new safety signals were identified. The most common adverse events were reversible cytopenias, which were manageable with dose reductions or delays, and included Grade 3 and Grade 4 neutropenia and 66% and 41% of the patients respectively. Grade 3 and Grade 4 thrombocytopenia was observed in 50% and 19% of patients respectively. Dose reductions or cycle delays due to adverse events were required for 59% of patients. The safety profile in the 13 patients subset was similar to the overall trial population. We expect the poster presented at ASH will include updated data from more recent data cut. The evening after that posters presented, Geron will be hosting a webcasted event in order to allow all investors to be informed of the updated data. We and Janssen believe that these results from 13 patients subset who were naive to lenalidomide and HMA and who lacked the del(5q) chromosomal abnormality, suggest the imetelstat could offer lower risk MDS patients and much needed alternative prior to preceding to HMAs and to a lenalidomide treatment. In comparison to a 54%, eight-week transfusion independence rate observed for imetelstat, much lower rates approximately 17% for HMAs and 27% for lenalidomide and no better safety profiles have been previously reported in similar lower risk MDS patient populations. As such, we expect of targeting this lower risk MDS population would not reduce the population of patients potentially eligible for imetelstat, but instead sequence imetelstat ahead of HMAs and lenalidomide in the treatment paradigm. I’m pleased to note, the Janssen used the data from Part 1 of IMerge to apply to the FDA for Fast Track designation for imetelstat, which was granted. For the treatment of adult patients with transfusion-dependent anemia due to lower risk MDS, who are non-del(5q) and who are refractory or resistant to erythropoiesis. We announced this in press release yesterday morning. As we announced at the end of July, Part 1 of IMerge is being reopened and expanded to enroll approximately 20 additional patients who are non-del(5q) and naïve to HMA and lenalidomide treatment. This is intended to increase the experience and confirm the benefit-risk profile of imetelstat in this refined target patient population. With appropriate approximately 20 additional patients, the total number of patients in Part 1 who were representative of the refined target patient population will be approximately 30, which was a sample size originally purposed for the protocol for Part 1 on which decision and move to Part 2 would be based. Enrollment for this expanded Part 1 is now open in several sites. In addition, the clinical data from IMerge, three preclinical abstracts by academic collaborators were also selected for presentations. All three abstracts build on data from previous studies investigating imetelstat effects and mechanism of action in preclinical models of hematologic myeloid malignancies. In an oral presentation, Dr. Steve Lane, colleagues of University of Queensland in Australia will describe their continuing exploratory work to understand the potential clinical efficacy of imetelstat and AML by using preclinical models throughout some patient samples. In two separate post presentations, Dr. Ronald Hoffman and his colleagues from the Icahn School of Medicine at Mount Sinai at and Dr. Catriona Jamieson and colleagues from the University of California at San Diego will present data from two independent preclinical studies investigating impact of imetelstat on malignant progenitor and stem cells in models of myelofibrosis and blast crisis chronic myeloid leukemia. We announced the dates and times of the imetelstat presentation at ASH in the press release this morning that is available on our website. Before we open the call to questions, I will also note that our search and evaluation process to identify and evaluate oncology products, programs and companies for potential acquisition continues. With that, operator, let’s open the call for questions.