Session: 604. Molecular Pharmacology and Drug Resistance: Myeloid Neoplasms: Poster III
Hematology Disease Topics & Pathways:
Research, Acute Myeloid Malignancies, AML, Translational Research, Diseases, Myeloid Malignancies
Results: JNJ-75276617 exhibited synergistic effects with venetoclax alone or in combination with azacitidine in AML cells bearing KMT2A-r in vitro. Proliferation assays in KMT2A-r MOLM-13 AML cells showed that doublet combination of JNJ-75276617 plus venetoclax induced a synergistic antiproliferative effect in vitro that was significantly increased when compared to JNJ-75276617 or venetoclax monotherapy. The triplet combination of JNJ-75276617 plus azacitidine and venetoclax further induced a synergistic antiproliferative effect that was significantly increased when compared to JNJ-75276617 monotherapy or the doublet combination of venetoclax plus azacitidine.
In the disseminated KMT2A-r MOLM-13 model in mice, monotherapy treatment with JNJ-75276617 at 10 mg/kg and azacitidine at 2 mg/kg induced a significant ILS of 35% each compared to the vehicle control group (p<0.0001 each), while 6% ILS was observed for mice treated with 100 mg/kg venetoclax (p=0.0076). The combination of azacitidine plus venetoclax, resulted in a significant ILS of 53% compared to the vehicle control (p<0.0001). Doublet combination treatment with either JNJ-75276617 plus azacitidine or plus venetoclax resulted in a significant ILS of 106% or 256%, respectively, as compared to the vehicle control (p<0.0001 each). The JNJ-75276617 triplet combination with azacitidine plus venetoclax induced a significant ILS of 277%, as compared to the vehicle control group (p<0.0001). These results further showed that either the doublet combinations of JNJ-75276617 plus venetoclax or azacitidine, or the triplet combination provided a superior increase in survival as compared with the clinical standard regimen of azacitidine plus venetoclax (p<0.0001 each). In a disseminated NPM1c model (OCI-AML3), JNJ-75276617 doublet or triplet combination with azacitidine and venetoclax also yielded superior survival versus the standard azacitidine plus venetoclax regimen, however triplet efficacy seemed most strongly driven by JNJ-75276617.
Conclusions: These studies suggest that the doublet combinations of either JNJ-75276617 plus venetoclax or azacitidine, or the triplet combination could potentially provide a beneficial treatment option for KMT2A- or NPM1-altered AML, and support the recently initiated clinical trial investigating JNJ-75276617 in combination with AML-directed therapies, including venetoclax and azacitidine (NCT05453903). JNJ-75276617 is also being clinically investigated as a monotherapy for R/R acute leukemia (NCT04811560).
Disclosures: Kwon: Janssen Pharmaceutica: Current Employment. Verhulst: Janssen Research & Development: Current Employment, Current equity holder in publicly-traded company. Goffin: Janssen Research & Development: Current Employment. Marien: Janssen Research & Development: Current Employment. Verbist: Janssen Research & Development: Current Employment. Guttke: Janssen R&D: Current Employment, Current equity holder in publicly-traded company. Thuring: Janssen: Current Employment, Current equity holder in publicly-traded company. Ferrante: Johnson & Johnson: Current Employment, Current equity holder in publicly-traded company, Current holder of stock options in a privately-held company. Daskalakis: Janssen: Current Employment, Current holder of stock options in a privately-held company; Sanofi: Current holder of stock options in a privately-held company. Pietsch: Janssen: Current Employment. Elsayed: Janssen: Current Employment, Current equity holder in publicly-traded company. Packman: Janssen: Current Employment, Current equity holder in publicly-traded company. Philippar: Janssen: Current Employment, Current equity holder in publicly-traded company, Membership on an entity's Board of Directors or advisory committees, Patents & Royalties.
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