On July 24, 2019 Kura Oncology, Inc. (Nasdaq: KURA), a clinical-stage biopharmaceutical company focused on the development of precision medicines for oncology, reported that the U.S. Food and Drug Administration (FDA) has granted Orphan Drug Designation to the Company’s menin-mixed lineage leukemia (menin-MLL) inhibitor KO-539 for the treatment of acute myeloid leukemia (AML) (Press release, Kura Oncology, JUL 24, 2019, View Source [SID1234537702]).
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"Orphan Drug Designation for AML represents a significant milestone in the development of KO-539," said Troy Wilson, Ph.D., J.D., President and Chief Executive Officer of Kura Oncology. "This decision by the FDA follows the clearance of our investigational new drug (IND) application in March 2019 and recognizes the potential for KO-539 to address a high unmet need for patients suffering from AML. We are very encouraged by our preclinical data in genetically defined subsets, such as tumors with MLL fusions and rearrangements and NPM1 mutations, and we are in the final stages of study startup for our Phase 1 clinical trial in relapsed or refractory AML."
The FDA’s Orphan Drug Designation program provides orphan status to drugs defined as those intended for the safe and effective treatment, diagnosis or prevention of rare diseases that affect fewer than 200,000 people in the United States. Orphan Drug Designation qualifies the sponsor of the drug for certain development incentives, including tax credits for qualified clinical testing, prescription drug user fee exemptions and seven-year marketing exclusivity upon FDA approval.
About KO-539
KO-539 is a potent and selective small molecule inhibitor of the menin-MLL protein-protein interaction. MLL-rearranged leukemias are characterized by chromosomal translocations of the MLL gene that are primarily found in patients with AML and acute lymphoblastic leukemia (ALL). These translocations form oncogenes encoding MLL fusion proteins, which play a causative role in the onset, development and progression of MLL-rearranged leukemias. The target genes of the MLL fusion proteins are also found to be overexpressed in a broader subset of AMLs characterized by oncogenic driver mutations in genes such as NPM1. These mutations also appear to be dependent on the interaction between menin and MLL, suggesting that the menin-MLL complex is a central node in epigenetic dysregulation driven by distinct oncogenic driver mutations known to be important in AML and other hematologic malignancies. In preclinical studies, KO-539 has demonstrated potent and selective inhibition of the proliferation of MLL-rearranged leukemia cell lines. Kura has also generated preclinical data showing robust and durable efficacy in multiple in vivo models of AML characterized by MLL-rearrangements or oncogenic driver mutations in genes such as NPM1.