SEATTLE, June 12, 2014 /PRNewswire/ -- CTI BioPharma Corp. (CTI) (NASDAQ and MTA: CTIC) today announced the initiation of an international cooperative group Phase 2 clinical trial of tosedostat in combination with low-dose cytarabine in older patients with Acute Myeloid Leukemia (AML) or high risk Myelodysplastic Syndrome (MDS). Tosedostat is a first-in-class selective inhibitor of aminopeptidases, which are required by tumor cells to provide amino acids necessary for growth and tumor cell survival. The trial is being conducted by the National Cancer Research Institute Haematological Oncology Study Group under the sponsorship of Cardiff University. The trial management group is led by Professor Alan K. Burnett, Head of Haematology in the Department of Medical Genetics, Haematology and Pathology at the School of Medicine at Cardiff University. Chroma Therapeutics Ltd., from whom CTI licensed tosedostat, is facilitating drug supply for the trial.
"As the population of patients 65 years of age and older with AML continues to grow, there are a large number of patients who are not suitable for conventional intensive chemotherapy and for these patients there is a significant unmet need for an alternative therapy that is effective and well tolerated," said Professor Burnett. "New agents that are being developed to target the underlying biology of the disease, such as tosedostat, may provide hope for these patients where there has been very little improvement in the outcome of these patients over the last couple of decades. Tosedostat has demonstrated encouraging clinical activity in AML with manageable toxicities that can be administered primarily as out-patient therapy, and we are pleased to get this study underway."
In this Phase 2/3 trial, referred to as the AML Less Intensive (LI-1) trial, patients will be randomized to standard treatment, low dose cytarabine, versus one of five novel investigational treatments, one of which is tosedostat, each in combination with low dose cytarabine. The trial will utilize a "Pick a Winner" trial design. 1 Under such a design, the Phase 2 portion of the trial is expected to initially enroll 50 patients per arm, and, if the complete response rate of cytarabine plus novel therapy appears satisfactory, an additional 50 patients per arm would be enrolled in the Phase 2 portion. Based on an interim analysis of complete response results, the trial management group may determine to move the applicable trial into the Phase 3 portion, which would then undertake to enroll 100 additional patients (for a total of 200 patients per arm). Overall survival will serve as the primary endpoint of the trial.
About Acute Myeloid LeukemiaApproximately 18,860 new cases of AML were expected to be diagnosed in the United States in 2013. 2 As of January 2008 an estimated 30,993 people were living with (or were in remission from) AML. 3 While AML may occur at any age, adults at least 60 years of age are more likely to develop the disease than younger people. 3 AML is a cancer characterized by the rapid growth of abnormal white blood cells that accumulate in the bone marrow and interfere with the production of normal blood cells. AML may develop from the progression of other diseases, such as MDS, a blood cancer that also affects the bone marrow leading to a decrease in circulating red blood cells. AML is the most common acute leukemia affecting adults, and its incidence increases with age. 3 The symptoms of AML are caused by the replacement of normal bone marrow with leukemic cells, which causes a drop in red blood cells, platelets and normal white blood cells, leading to infections and bleeding. AML progresses rapidly and is typically fatal within weeks or months if left untreated. Although a substantial proportion of younger individuals who develop AML can be cured, AML in the elderly typically responds poorly to standard therapy with few complete remissions. About Tosedostat Tosedostat is an oral aminopeptidase inhibitor that has demonstrated anti-tumor responses in blood-related cancers and solid tumors in Phase 1–2 clinical trials. CTI has an exclusive marketing and co-development agreement with Chroma Therapeutics Ltd. for drug candidate tosedostat in North, Central and South America.