Onconova Therapeutics (ONTX) – New Leukemia Data Presented Supports Wide Range Of Action


Thursday, June 15, 2023

Onconova Therapeutics is a clinical-stage biopharmaceutical company focused on discovering and developing novel products for patients with cancer. The Company has proprietary targeted anti-cancer agents designed to disrupt specific cellular pathways that are important for cancer cell proliferation. Onconova’s novel, proprietary multi-kinase inhibitor narazaciclib (formerly ON 123300) is being evaluated in two Phase 1 dose-escalation and expansion studies. These trials are currently underway in the United States and China. Onconova’s product candidate rigosertib is being studied in an investigator-sponsored study program, including in a dose-escalation and expansion Phase 1/2a investigator-sponsored study with oral rigosertib in combination with nivolumab for patients with KRAS+ non-small cell lung cancer.

Robert LeBoyer, Senior Vice President, Equity Research Analyst, Biotechnology, Noble Capital Markets, Inc.

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Data In Mantle Cell Lymphoma Updated. Onconova presented new data testing narazaciclib in mantle cell lymphoma (MCL) at the annual International Conference on Malignant Lymphoma, adding to data presented at the AACR meeting in April 2023. The preclinical studies tested the combination of narazaciclib as a single agent or in combination with ibrutinib (Imbruvica from AbbVie, an inhibitor of BTK or Bruton tyrosine kinase), a drug widely used to treat mantle cell lymphoma. Narazaciclib also was tested against approved CDK4/6 inhibitors and showed superior efficacy. 

Presentation Expands On Previous Data. Narazaciclib was tested with ibrutinib in multiple cell lines that are sensitive or resistant to ibrutinib. The combination showed anti-tumor activity that was synergistic compared with either drug alone. The drugs were shown to use separate pathways to downregulate cell cycle checkpoints and lead to G1 cell cycle arrest. This stops the cancer cells reproduction cycle, causing the cell to die. The combination inhibited tumor growth and reduced infiltrations of malignant B-cells in the bone marrow.


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