Spiro Rombotis
Analyst · Lazard Capital Markets
Thank you, Corey, and good afternoon, everyone. It's a pleasure to update you this afternoon on our corporate progress and financial results for the first quarter ended March 31, 2012.
First, I'm pleased to report that during this period, we continued to open new study sites and enroll patients in the SEAMLESS Phase III trial of our lead drug candidate, oral sapacitabine capsules, as frontline treatment in acute myeloid leukemia or AML. As a reminder, SEAMLESS is a randomized trial testing sapacitabine in approximately 485 elderly patients with AML, aged 70 years or older, who are not candidates for, or have refused, intensive induction therapy.
In addition to SEAMLESS, we reported earlier today completion of enrollment in the Phase II portion of the investigator-led Phase II/III Pick a Winner or LI-1 Trial. This is a randomized trial comparing sapacitabine to low-dose cytarabine in patients aged 60 years or older with previously untreated AML or high-risk myelodysplastic syndromes, or MDS, who are unfit for intensive chemotherapy. Importantly, except for drug product supplied by Cyclacel, costs for this investigator-led study are borne in their entirety by the International Cooperative Leukemia Group chaired by Professor Alan Burnett.
Earlier in the year, we also reported clinical data showing that sapacitabine is active in patients with myelodysplastic syndromes and certain solid tumors positive for the BRCA genetic mutation in terms of germline. We are encouraged that the potential for line extensions of sapacitabine as a pipeline within the drug is starting to emerge.
It is pertinent to our clinical trial strategy that during the quarter, the American Society of Hematology, or ASH, issued a report that identified 7 specific high-medical need areas for the care of patients with hematological diseases in the United States. One of the 7 areas was finding an effective and personalized treatment for the elderly with AML. This recommendation from our National Society of Hematology Specialists underscores the high unmet medical need that sapacitabine could address with SEAMLESS and the LI-1 investigator-led study.
During the quarter, we also reported top line response data from an ongoing multicenter Phase II randomized trial of oral sapacitabine in older patients with MDS after treatment failure of hypomethylating agents such as azacitidine and/or decitabine. Eight patients responded with 2 complete remissions, or CRs, 2 complete remissions with incomplete platelet count recovery, or CRps, and 4 major hematological improvements of platelet counts or neutrophils. As more than 50% of the patients are still alive in this study, longer follow-up is needed to assess 1-year survival and overall survival.
Updated data from this study will be presented at the ASCO Annual Meeting next month. We will initiate regulatory discussions regarding an appropriate registration plan in this setting after a dosing schedule is selected. Our efforts in combining sapacitabine with other anti-cancer agents addressed another 1 of the 7 high-need areas identified by ASH. In particular, harnessing recent discoveries of important genetic and biologic markers and new insights of how diseased genetics and patient genetics affect response to treatment. This direction will help us not only develop novel therapies directed against disease targets, but also to ensure that patients receive the right treatments for the particular genetic makeup to maximize successful outcomes.
For example, during the quarter, in the 103rd Annual Meeting of the American Association of Cancer Research, or AACR, translational research findings for 3 studies involving sapacitabine were reported. One abstract reported additional pre-clinical data to further support the potential for sapacitabine to be used alone or in combinations to treat homologous recombination DNA repair, or HRR, defective tumors, such as Ataxia Telangiectasia Mutated, or ATM, tumors or BRCA defective tumors.
We have previously reported that investigators at the University of Texas M.D. Anderson Cancer Center are conducting, at their expense, an ongoing Phase II investigator-led study of sapacitabine in combination with cyclophosphamide and rituximab. This study is enrolling patients with previously treated chronic lymphocytic leukemia, or CLL, or small lymphocytic lymphoma, SLL, who carry the 11q22-23 deletion. Deletion at chromosome 11q22-23 is associated with the ATM mutation, an important regulator of the HRR DNA repair pathway and a possible predictor of sensitivity to sapacitabine's mechanism.
In another abstract presented at AACR, Professor William Plunkett and his group from M.D. Anderson Cancer Center described the sensitization of HRR defective model cell lines to sapacitabine when combined with other DNA damaging agents, whose effects are repaired by HRR and other DNA repair pathways. Combinations of sapacitabine with bendamustine, cisplatin, oxaliplatin or a cyclophosphamide analogue each showed effects in cells with DNA repair pathway defects that were pronounced more than when giving each drug on its own.
Finally, the third abstract presented at AACR by Dr. Kent Christopherson and colleagues at Rush Medical College in Chicago performed a comparison among others of sapacitabine and cytarabine activity in AML cell lines and in bone marrow and peripheral blood cells from AML patients. The authors concluded that sapacitabine exhibited improved activity and induction of cell death in AML cell lines and patient samples compared with cytarabine.
As a reminder, cytarabine is the only drug approved as frontline AML therapy in the United States. The fact that since its approval in 1969 we have had no other drugs reach the market, underlines the unique opportunity addressed by sapacitabine. As a further reminder, cytarabine is the comparator control drug in the LI-1 investigator-led trial previously reported.
Progress with 2 additional pipeline candidates from Cyclacel was also reported during the quarter at AACR, specifically, the development of a potent and selective preclinical-stage Polo-Like Kinase 1, or Plk1 inhibitor, as well as one of our Aurora kinase inhibitors.
In the Plk1 program, in addition to proposing a predictive biomarker-driven, clinical development strategy using p53 protein status, the discovery which leverages the efforts of Cyclacel's founders in the areas of p53 and mitotic kinases, such as Polo, to develop oral therapies that target the various phases of cell cycle control for treating cancer and other serious diseases.
In particular, Cyclacel scientists and academic collaborators reported at AACR the biological characterization of a compound named #4, a potent and selective preclinical-stage Plk1 inhibitor, selected for further development from Cyclacel's novel Plk1 inhibitor compound series.
In particular, in a panel of esophageal cancer cell lines, sensitivity to this compound correlated with [indiscernible] p53. Esophageal cell lines that lacked functional p53 showed the greatest sensitivity to this compound. Short-drug exposure times demonstrated differential sensitivity between cancerous esophageal cells versus control, outlining the potential broad therapeutic index for this compound and other Plk1 inhibitors from Cyclacel in treating esophageal cancers and, in particular, those with nonfunctional p53. Moreover, the status of p53 could be used as a predictive biomarkers in future clinical trials to identify response of patients to the activity of this Plk1 drug.
I will now turn the call over to Judy, who will review our clinical progress. Judy?