On February 25, 2019 Aptose Biosciences Inc. ("Aptose" or the "Company") (NASDAQ: APTO, TSX: APS), reported that it has submitted an Investigational New Drug (IND) application for CG-806 to the U.S. Food and Drug Administration (FDA) requesting approval to initiate its Phase 1 clinical trial program (Press release, Aptose Biosciences, FEB 25, 2019, View Source [SID1234533629]). CG-806 is an oral, first-in-class small molecule inhibitor of all known forms of FLT3 and BTK kinases being developed for the treatment of patients with select hematologic malignancies, including chronic lymphocytic leukemia (CLL/SLL) and non-Hodgkin’s lymphomas, as well as for patients with relapsed/refractory acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS).
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Pending regulatory allowance, Aptose plans to conduct a Phase 1 trial with orally administered CG-806 in patients with relapsed or refractory B cell malignancies, including CLL/SLL and non-Hodgkin lymphomas (NHL) who failed or are intolerant to standard therapies. Pending the collection of predictive pharmacokinetic data in humans, Aptose would seek allowance from the FDA to move into the AML/MDS patient population in a separate Phase1 trial. The initial goal of both trials is to evaluate safety, tolerability and pharmacokinetics of CG-806 in these patient populations.
"In preclinical studies, Aptose and collaborators demonstrated that CG-806 potently inhibits all known forms of FLT3 and BTK and suppresses multiple oncogenic pathways to cripple the malignant cells and avoid rapid emergence of drug resistance, but is not a "dirty" drug that inadvertently inhibits numerous targets associated with toxicity. CG-806 delivers safety and durability of cures in animal models of cancer and readily differentiates from competitor FLT3 and BTK inhibitors," said William Rice, Ph.D., Chairman, President & CEO. "Principle investigators from across the country have voiced their eagerness to enroll patients in both clinical trials, and we hope CG-806 can serve as a new tool for clinicians to treat patients critically ill with hematologic cancers, particularly those who discontinued other BTK or FLT3 inhibitors."
About CG-806
CG-806 is an oral, first-in-class pan-FLT3/pan-BTK multi-cluster kinase inhibitor. This small molecule, in-licensed from CrystalGenomics Inc. in Seoul S. Korea, demonstrates potent inhibition of wild type and all mutant forms of FLT3 (including internal tandem duplication, or ITD, and mutations of the receptor tyrosine kinase domain and gatekeeper region), cures animals of acute myeloid leukemia (AML) tumors in the absence of toxicity in murine xenograft models, and represents a potential best-in-class therapeutic for patients with AML. Likewise, CG-806 demonstrates potent, non-covalent inhibition of the wild type and Cys481Ser (C481S) mutant forms of the BTK enzyme, as well as other oncogenic kinase pathways operative in B cell malignancies, suggesting CG-806 may be developed for various B cell malignancy patients (including CLL, MCL, DLBCL and others) that are resistant/refractory/intolerant to covalent BTK inhibitors. Because CG-806 targets key kinases/pathways operative in malignancies derived from the bone marrow, it is in development for B cell cancers and AML.