On November 12, 2021 Biosight Ltd., a pharmaceutical development company developing innovative therapeutics for hematological malignancies and disorders, reported the initiation of a Phase 2 trial to evaluate aspacytarabine (BST-236), Biosight’s proprietary antimetabolite, as a second line treatment for patients with relapsed or refractory myelodysplastic syndrome (MDS) or acute myeloid leukemia (AML) (Press release, Advaxis, NOV 12, 2021, View Source;soc_trk=ma [SID1234595728]). The multi-center study will be conducted across 18 leading U.S. and Israeli sites including Memorial Sloan Kettering Cancer Center and The University of Texas MD Anderson Cancer Center.
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"Biosight has built a strong foundation of compelling data that suggests that aspacytarabine may serve as a more tolerable and effective standard of care treatment for patients with AML," said Dr. Ruth Ben Yakar, Chief Executive Officer of Biosight. "The initiation of this multi-center, U.S. based, Phase 2 study is an important step forward in the development of aspacytarabine, seeking to address unmet needs in the treatment of patients with relapsed or refractory AML and MDS. We are proud to be continuing our momentum in the clinic and look forward to collaborating with leading academic medical centers as we progress the study."
Eytan Stein, M.D., Hematologic Oncologist at Memorial Sloan Kettering Cancer Center and lead investigator of the study said "I’m encouraged by the results from Biosight’s Phase 2b trial to be presented at the 63rd American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting. The efficacy achieved in a challenging population, across key measures including complete remission and MRD (-) rates, duration of response and overall survival, are noteworthy. Furthermore, these results were particularly impressive as they were achieved with a favorable safety and tolerability profile in patients who are unfit for intensive chemotherapy. Patients with relapsed or refractory AML and MDS have limited treatment options and poor prognoses, with many patients unable to tolerate intensive chemotherapy. I look forward to leading this new Phase 2 study to evaluate the potential of aspacytarabine which may ultimately become the standard of care for relapsed or refractory MDS and AML patients for whom currently there are no effective treatments."
The Phase 2 open label multi-center study will assess the safety and efficacy of BST-236 as a single agent in adult patients unfit for standard therapy with AML or higher-risk (HR)MDS who fail to respond to, or have relapsed following, first line therapy. A similar study in patients with relapsed/refractory AML and MDS is ongoing in collaboration with the European cooperative group, Groupe Francophone des Myélodysplasies (GFM). Approximately 40 adult patients with relapsed and/or refractory AML and approximately 40 adult patients with relapsed and/or refractory HR MDS will be enrolled into the two studies. Primary endpoints include complete remission (CR) rate in AML patients and Overall Response Rate (ORR) in MDS patients, with ORR defined as the proportion of patients who achieve a CR or partial response (PR) per proposal for modification of the International Working Group (IWG) criteria for MDS, 2006.
About Aspacytarabine (BST-236)
Aspacytarabine is a novel proprietary anti-metabolite. It is composed of cytarabine covalently bound to asparagine, acting as a pro-drug of cytarabine. Cytarabine has served as the backbone of AML therapy for over 45 years due to its superior efficacy. However, it is associated with severe bone marrow, gastrointestinal, and neurological toxicities, which significantly limit its use, especially in older and medically compromised patients. Due to its unique pharmacokinetics and metabolism, aspacytarabine enables high-dose therapy with lower systemic exposure to free cytarabine and relative sparing of normal tissues. As such, aspacytarabine may serve as a new therapy for AML and other hematological malignancies and disorders, including for older adults who are unfit for intensive therapy.
Aspacytarabine was granted FDA Fast Track Designation for treatment of AML patients unfit for standard chemotherapy, and FDA and EMA Orphan Drug Designations, which entitle Biosight to seven and ten years of market exclusivity in the U.S. and Europe, respectively, upon aspacytarabine marketing approval for the treatment of AML in each territory.
Interim results from an ongoing Phase 2b study evaluating aspacytarabine as a single-agent first-line AML therapy demonstrate safety and single-agent activity, and additional studies are ongoing to evaluate aspacytarabine as a second line treatment for patients with relapsed or refractory MDS or AML. For more information regarding the Phase 2b clinical study of BST-236, please visit www.clinicaltrials.gov.