Aptose Announces FDA Allowance of IND for Phase 1a/b Study of CG-806 in Acute Myeloid Leukemia

Oral FLT3/BTK inhibitor CG-806 expands development beyond B-cell malignancies to the treatment of AML

Phase 1a/b study in B-cell malignancies continues through dose escalation

SAN DIEGO, CA, USA and TORONTO, Canada I June 29, 2020 I Aptose Biosciences Inc. (Nasdaq: APTO; TSX: APS), a clinical-stage company developing highly differentiated therapeutics that target the underlying mechanisms of cancer, today announced that the U.S. Food and Drug Administration (FDA) completed its review of the company’s Investigational New Drug (IND) application and has granted IND allowance for the initiation of a Phase 1a/b clinical study of CG-806, the company’s highly potent, oral FLT3/BTK inhibitor, in patients with acute myeloid leukemia (AML). CG-806 is currently in a Phase 1 dose escalation study in patients with B-cell malignancies, including chronic lymphocytic leukemia (CLL) and non-Hodgkin’s lymphomas (NHL), who have failed or are intolerant to current therapies.

“Our strategy was to identify a starting dose of CG-806 that we believe could be therapeutically active in critically ill patients with relapsed or refractory AML. We are pleased that the FDA has allowed us to initiate a clinical trial in these patients at a starting dose of 450mg BID. Despite recent advances in the treatment of AML, many patients relapse or remain refractory to current therapies leading to a poor overall prognosis,” said Rafael Bejar, M.D., Ph.D., Senior Vice President and Chief Medical Officer.  “Based on strong preclinical evidence of CG-806’s activity against AML – including demonstration of mutation-agnostic and genotype-agnostic potency, particularly compared against other FLT3 inhibitors, and its ability to safely cure AML in murine leukemia models  –  we believe CG-806 offers hope to the fragile and difficult-to-treat AML patient population. We continue to dose escalate in an ongoing study in patients with CLL and other B cell cancers, and are eager to advance this separate AML protocol through Institutional Review Boards at key clinical sites, recruit appropriate AML patients, and initiate dosing as soon as possible.”

Aptose intends to initiate the Phase 1 a/b study in the second half of 2020 in AML patients who have relapsed, are resistant or refractory to current treatment.

About CG-806

CG-806 is an oral, first-in-class FLT3/BTK cluster selective kinase inhibitor and is in Phase 1 clinical studies for the treatment of hematologic malignancies. This small molecule 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 AML in the absence of toxicity in murine leukemia models, and represents a potential best-in-class therapeutic for patients with AML and other myeloid malignancies. 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/SLL, FL, MCL, DLBCL and others) that are resistant/refractory/intolerant to covalent or other non-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.

About Aptose Biosciences

Aptose Biosciences is a clinical-stage biotechnology company committed to developing personalized therapies addressing unmet medical needs in oncology, with an initial focus on hematology. The Company's small molecule cancer therapeutics pipeline includes products designed to provide single agent efficacy and to enhance the efficacy of other anti-cancer therapies and regimens without overlapping toxicities. The Company has two clinical-stage investigational products for hematologic malignancies: CG-806, an oral, first-in-class mutation-agnostic FLT3/BTK kinase inhibitor, is in a Phase 1 trial in patients with relapsed or refractory B cell malignancies, including chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL) and non-Hodgkin lymphoma (NHL), who have failed or are intolerant to standard therapies, and is expected to start a separate Phase 1 trial in patients with relapsed or refractory acute myeloid leukemia (AML); APTO-253, the only clinical stage agent that directly targets the MYC oncogene and suppresses its expression, is in a Phase 1b clinical trial for the treatment of patients with relapsed or refractory acute myeloid leukemia (AML) or high risk myelodysplastic syndrome (MDS). For further information, please visit www.aptose.com.

SOURCE: Aptose Biosciences

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