Spiro Rombotis
Analyst · Roth Capital
Thank you, Alex, and good afternoon, everyone. On today's call, we will provide our fourth quarter and full year business update and review progress with our clinical development priorities. In our transcriptional regulation program with CYC065, we have achieved clinical proof of mechanism in terms of durable suppression of the Mcl-1 biomarker. We look forward to reporting further details from the ongoing Phase I study with CYC065 in mid-April at an oral presentation during the American Association for Cancer Research, or AACR, 2018 Annual Meeting. We believe that the Phase I results provide a strong rationale for evaluating CYC065 in combination with venetoclax in patients with chronic lymphocytic leukemia or CLL. We have recently submitted the protocol for this study to FDA and expect to start enrolling soon after IRB approval. In addition, we have been in discussions with investigators about evaluating CYC065 in neuroblastoma, a predominantly pediatric cancer with poor prognosis. In another important development we have jointly developed in collaboration with an academic center and a pharmaceutical company, a protocol for a clinical study that will evaluate a combination regimen of sapacitabine and an approved PARP inhibitor. Finally, we have completed analysis over the results from the SEAMLESS Phase III study of sapacitabine in AML and plan to discuss the data with regulatory authorities. During the year, we also strengthened our balance sheet by adding approximately $14.9 million net of expenses. We estimate our capital resources to be sufficient to fund currently planned programs through the first quarter of 2020. Let me now provide some more details on our transcriptional regulation program with CYC065, our cyclin-dependent kinase inhibitor. As many of you know, Cyclacel's founding scientist, Professor David Lane, is an internationally recognized authority in cell cycle biology. He discovered p53, a key tumor suppressor gene that malfunctions in about 2/3 of human cancers. Under his guidance, Cyclacel's drug discovery and development programs concentrated on CDK inhibitors, and in particular, the CDK 2/9 isoform, which is a key component of the p53 pathway. CDK 4/6 inhibitors, such as palbociclib, are approved for a type of breast cancer in combination with standard-of-care hormonal chemotherapy. Although this represents a major therapeutic advance, it may be worthwhile to point out that the first clinical trials of palbociclib reported mostly stable disease and almost no partial responses. Only in combination with letrozole did palbociclib achieve a dramatic improvement in progression-free survival and went on to a breakthrough designation and FDA approval. CDK 2/9 inhibitors are designed to lower the threshold of killing cancer cells, which have become resistant to current treatment. Resistant cancer cells often over express BCL family proteins, such as Bcl-2 and Mcl-1, which are implicated in the survival and ultimate immortalization of these malignant cells. Although venetoclax, a drug that suppresses Bcl-2, was recently approved by FDA for CLL, there are no drugs that have demonstrated durable suppression of Mcl-1 in the clinic. Consequently, an intense competitive race is ongoing amongst several biopharmaceutical companies to address this major challenge in oncology therapeutics. We are excited to have discovered in Part 1 of our ongoing Phase I clinical study that CYC065 demonstrated durable reduction of Mcl-1 expression for at least 24 hours. This was observed in 11 out of 13 patients treated at the recommended Phase II dose, following a single dose of CYC065, which was generally well tolerated. We believe that this is the first time that such a clinical finding has been reported, and we are keen to build on our lead in this important field. Part 2 of the Phase I translational study would enroll patients with advanced solid tumors, in particularly those with amplifications of Mcl-1, MYCN or cyclin E. Part 2 will also evaluate CYC065 in a more intensive schedule dosed on 2 days per week for two weeks of a three-week cycle and will open for enrollment upon IRB approval, which we believe is imminent. Patient specimens will be collected for assessment of biomarkers related to CYC065's mechanism of action. In our view, similarly to CDK 4/6 inhibitors, CYC065 may be the most useful in combination with other anticancer agents. We are, therefore, planning to initiate shortly a Phase I study of CYC065 in combination with venetoclax in patients with relapsed or refractory CLL, where we believe Mcl-1 suppression may be beneficial. The protocol for this study has been submitted to the FDA. The study will evaluate safety, pharmacokinetics and pharmacodynamics of the combination, including biomarkers related to the mechanism of action of CYC065. Discussions with principal investigators and/or corporate groups have progressed with the objective of evaluating CYC065 in both pediatric and adult patients with solid tumors. The company is discussing with an investigator corporative group, a potential evaluation of CYC065 in patients with neuroblastoma in mostly pediatric, life-threatening malignancy, frequently associated with MYCN amplification. Pediatric neuroblastoma with MYCN amplification has a poor prognosis, and there is a desperate need for new treatments for these children. CYC065 may work in neuroblastoma because inhibition of CDK 2/9 is synthetically lethal with MYCN amplification. In other words, MYCN-amplified cancers are very sensitive to the drug's mechanism. There is a strong preclinical rationale for the evaluation of CYC065 in neuroblastoma, including improved survival in MYCN-amplified animal models. In another study to be conducted as an IST, CYC065 will be evaluated in adult and pediatric patients with leukemias, including acute myeloid leukemia, or AML, acute lymphocytic leukemia, or ALL, and in particular, those with mixed lineage leukemia rearrangements or MLL-r. This IST is undergoing institutional review and is expected to open later this year. Once again, Cyclacel will provide CYC065 but will not be paying for the costs of patient enrollment. Let us now turn to our DNA Damage Response, or DDR program with sapacitabine, and the combination study we mentioned at the beginning. This will be a Phase Ib/II investigator-sponsored trial, or IST, administering the combination regimen to patients with BRCA mutant breast cancer. Cyclacel will provide sapacitabine investigational drug products, but will not be paying for patient equipment costs. This IST is expected to start in the immediate future, and more details will be provided at that time. PARP inhibitors, given as single agents, are standard of care in homologous recombination deficient, or HRD, breast and ovarian cancers. HRD cancers include those that are positive for BRCA mutations. Preclinical evidence and early clinical data also support investigational use of PARP inhibitors in HRD, pancreatic and prostate cancers. There are no other approved drugs for HRD cancers, and that unmet medical need exists to improved on standard-of-care therapy in breast and ovarian cancer. Sapacitabine works by an HRD-relevant mechanism of action and has shown promising and durable clinical activity in BRCA mutation-positive patients with breast, ovarian and pancreatic cancers. In parallel, as part of our DNA Damage Response, or DDR program, we are also studying a sapacitabine and seliciclib regimen to disrupt the ability of cancer cells to repair damage to the DNA and thus restore their sensitivity to anticancer therapy. We completed enrollment of Parts 1 and 2 of the Phase I study with a combination of sapacitabine and seliciclib, our first-generation CDK 2/9 inhibitor in patients with advanced solid cancers. Interim data from the study represented at the 2016 American Society of Clinical Oncology, or ASCO, Annual Meeting, which demonstrated promising antitumor activity in a subgroup of 45 patients who tested positive for BRCA mutations. Durable responses with this regimen included one confirmed complete response, or CR, and five confirmed partial responses, or PRs, in patients with breast, ovarian and pancreatic cancers, all of whom tested positive for BRCA mutations. Of note, two responders with BRCA-positive breast cancer achieved 1.5 and over five years of treatment, respectively. Long duration of therapy in such heavily-pretreated patients is rare. Several other patients who tested positive for BRCA at baseline also showed durable, stable disease. No PRs were observed in BRCA wild-type patients, i.e., those testing negative for BRCA mutations. Based on these results and investigator encouragement, we are currently enrolling a Part 3 of this study to evaluate alternative dosing schedules and collect more data in BRCA-positive patients with other solid tumors, including ovarian and pancreatic cancer. Let me briefly address sapacitabine in AML and the data from the SEAMLESS study, which were the subject of an oral presentation at the American Society of Hematology, or ASH, Annual Meeting in December 2017. Although the study did not reach its primary endpoint of statistically significant superiority in overall survival, we're encouraged by the higher complete remission rate on the sapacitabine-decitabine arm, especially in the subgroup with the low white blood cell count, which comprised approximately 2/3 of the study's population. The presentation included additional data from prespecified and exploratory analysis of subgroups that may benefit from treatments with the sapacitabine-decitabine alternating regimen. The company believes that the subgroup results have defined a patient population for whom the sapacitabine regimen may represent an improvement over low-intensity treatment by decitabine alone. We have recently completed exploratory analysis of SEAMLESS subgroups, including interaction tests to test the likelihood that subgroup findings are due to chance. In preparation for discussing the totality of SEAMLESS data with regulators, we are preparing briefing documents for submission to EU and U.S. regulatory authorities with the objective of determining a potential regulatory pathway for sapacitabine in AML. Let me now turn to ISTs of seliciclib conducted by our collaborators. In the IST, also called the TRAFIC trial, sponsored by the U.K. Medical Research Council, which is evaluating seliciclib in rheumatoid arthritis, the Independent Data Monitoring Committee, or IDMC, determined that Part 1 of this study was successfully completed as per protocol. The IDMC recommended continuation of the trial into Part 2 to assess potential efficacy of seliciclib as an addition to existing anti-TNF therapy based on a composite outcome of response in patients with moderate to severe rheumatoid arthritis. The Phase II IST in patients with Cushing's disease and a Phase II study of seliciclib in patients with cystic fibrosis are continuing enrollment. As these programs are not funded by us, we will report progress when the respective investigators provide updates. We are looking forward to an exciting future for the company. We are advancing our clinical programs led by CYC065 in selected patient populations relevant to the drug's mechanism and informed by our scientific expertise in cell cycle biology. Before handing the call over to Paul for a review of the financials, let me review our goals for the rest of 2018, report updated CYC065 Phase I data in patients with advanced cancers; initiate CYC065 Phase Ib in relapsed, refractory CLL in combination with venetoclax; start enrollment in the Phase Ib/II IST of the combination regimen of an approved PARP inhibitor and sapacitabine in patients with BRCA-mutant breast cancer; start enrollment in the Phase Ib/II IST of CYC065 in pediatric patients with neuroblastoma; update mature data from the Part 1 extension of the sapacitabine and seliciclib combination in patients with BRCA-positive advanced breast cancer; and complete Part 3 enrollment of the sapacitabine and seliciclib combination in patients with BRCA-positive breast, ovarian and pancreatic cancers; submit CYC140 PLK 1 inhibitor IND application and conduct regulatory authority meetings regarding the SEAMLESS study of sapacitabine in AML. We will now review our financials. Paul?