John A. Scarlett
Analyst · Piper Jaffray
Thanks, Olivia. Good afternoon, everyone. Most of you are aware or have seen that the abstract selected for presentation at ASH were made available to the public this morning. Among these was an abstract submitted in August of 2013 by Dr. Ayalew Tefferi containing certain of his preliminary data from his ongoing investigator-sponsored trial of imetelstat in patients with myelofibrosis which is being conducted at Mayo Clinic. Data from the IST is maturing and evolving on an ongoing basis. We expect Dr. Tefferi's presentation of this abstract at the ASH Annual Meeting to include additional and updated safety and efficacy data from this study. The oral presentation is scheduled to occur during the session entitled Myeloproliferative Syndromes: Clinical: Novel Therapeutic Strategies, which will take place on Monday, December 9, 2013, at 4:45 p.m. Central Time. To comply with the strict embargo policy, stipulated by the American Society of Hematology and to afford Dr. Tefferi the opportunity to present his findings in an appropriate clinical form, we are not able to provide any commentary about these data before his oral presentation at ASH. For those of you on the call who are not as familiar with this study, Dr. Tefferi's IST was initiated to evaluate the safety and efficacy of imetelstat in patients with MF and to determine an appropriate dose and schedule for further evaluation. The trial is an open label study in patients with primary MF, post-essential thrombocythemia MF, and/or post-polycythemia vera MF. And these patients all have intermediate-2 or high-risk disease as defined DIPSS Plus. The primary endpoint is overall response rate, which is defined by the proportion of patients who are classified as responders, which means that they have achieved either a clinical improvement, or CI, a partial remission, or PR, or complete remission, or CR, consistent with the criteria of the 2013 IWG-MRT. Secondary endpoints include reduction of spleen size, improvement in anemia, inducement of red blood cell transfusion independence, safety and tolerability. In the initial cohort of patients in the IST, Cohort A, imetelstat was given once every 3 weeks. In the second cohort of patients, Cohort B, imetelstat was given weekly for 4 weeks, followed by 1 dose every 3 weeks. In addition to Cohorts A and B, Dr. Tefferi has informed us that enrollment has commenced in additional cohorts of patients with MF to evaluate the safety and efficacy of imetelstat using different dosing algorithms. Based on his experience with imetelstat in the initial patients with MF, Dr. Tefferi is also interested in evaluating imetelstat in different patient populations. As we previously disclosed, he's initiated enrollment of a cohort of patients with MF that has transformed into AML known as blast-phase MF. He's also commenced enrollment of a cohort of patients with certain subpopulation of MDS. Dr. Teferri has informed us that he has enrolled more than 50 patients across all of these cohorts since the IST was initiated in November 2012. We believe that diseases such as MF, and possibly AML and MDS, represent the greatest value-creating opportunity for Geron because many patients have significant unmet medical needs, and unlike existing therapies, we believe imetelstat has the potential to address the underlying neoplasm. We plan to move forward with further development of imetelstat in MF. Pending additional input from regulators, investigators and other experts, as well as further insight from the additional and updated safety and efficacy data to be presented at ASH, we expect to initiate a Geron-sponsored multi-center trial with imetelstat in the first half of 2014. In the first quarter of next year, we expect to give guidance regarding the key endpoints, scope, design and timing for this Geron-sponsored study in MF, as well as further elaboration on the development and registration plan for imetelstat in this indication. With that operator, let's open the call to questions, please.