Syndax Announces FDA Clearance of IND Application for Targeted Menin Inhibitor

Syndax Pharmaceuticals announced the U.S. Food and Drug Administration (FDA) has cleared the Company's Investigational New Drug (IND) application to begin a Phase 1/2 trial for SNDX-5613, a targeted Menin inhibitor, in patients with relapsed/refractory (R/R) acute leukemia.

"The FDA's acceptance of our IND for SNDX-5613 represents an important event in the development of targeted therapies for patients with acute leukemias," said Briggs W. Morrison, M.D., Chief Executive Officer of Syndax. "The advancement of SNDX-5613 builds on three decades of scientific investigation that explored the Menin-MLL-r interaction and its importance in a subset of genetically defined leukemias. Our preclinical results strongly support the therapeutic potential of SNDX-5613 for patients with MLL-r and NPM1 mutant leukemias, many of whom do not derive a durable benefit from existing treatments. We look forward to moving this program into the clinic."

The Phase 1/2 open-label trial will assess orally administered SNDX-5613 in patients with R/R acute leukemias. The Phase 1 portion of the study will assess the safety, tolerability and pharmacokinetics of SNDX-5613, and will seek to establish a recommended Phase 2 dose. The Phase 2 portion will evaluate efficacy, as defined by Complete Remission rate, across three expansion cohorts enrolling adult patients with MLL-rearranged (MLL-r) acute lymphoblastic leukemia (ALL), MLL-r acute myeloid leukemia (AML), and NPM1 mutant AML.

MLL rearrangements occur in approximately 80% of acute leukemia cases in infants and up to 10% of all leukemias. In preclinical models of MLL-r acute leukemias, SNDX-5613 demonstrated robust, dose-dependent inhibition of tumor growth, resulting in a marked survival benefit. Menin-MLL interaction inhibitors have also demonstrated robust treatment benefit in multiple pre-clinical models of NPM1 mutant AML, which represents the most frequent genetic abnormality in adult AML.

Rearrangements of the MLL gene give rise to MLL-r acute leukemias, known to have a poor prognosis, with less than 55% of patients surviving past 5 years. MLL rearrangements produce fusion proteins that require interaction with the protein called Menin to drive leukemic cancer growth. Disruption of the Menin-MLL-r interaction has been shown to halt the growth of MLL-r leukemic cells. MLL-r leukemias, which are routinely diagnosed through currently available cytogenetic or molecular diagnostic techniques, occur in approximately 80% of infant acute leukemias and up to 10% of all acute leukemias. There are currently no approved therapies indicated for MLL-r leukemias.

NPM1 mutant AML, which is distinguished by point mutations in the NPM1 gene that drive the leukemic phenotype, is the most common type of cytogenetically normal adult AML and represents approximately 30% of all adult AML cases. This subtype of AML has a 5-year overall survival rate of approximately 50%. Similar to MLL-r leukemias, NPM1 mutant AML is highly dependent on the expression of specific developmental genes, shown to be negatively impacted by inhibitors of the Menin-MLL interaction. NPM1 mutant AML is routinely diagnosed through currently available screening techniques. There are currently no approved therapies indicated for NPM1 mutant AML.

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