CAMBRIDGE, Mass.--(BUSINESS WIRE)-- Ribon Therapeutics, a clinical stage biotechnology company developing therapeutics targeting stress support pathways, today announced that data from its first-in-human Phase 1 trial evaluating RBN-2397, its small molecule inhibitor of PARP7, as a monotherapy in patients with advanced solid tumors was selected for an oral presentation at the 2021 American Society of Clinical Oncology (ASCO) Annual Meeting. Presenting the data will be Gerald S. Falchook, M.D., Director, Drug Development, Sarah Cannon Research Institute at HealthONE, Denver, CO and Clinical Investigator in the RBN-2397 Phase 1 trial. The full meeting program is available at: www.asco.org.

“The data being presented at ASCO emphasizes the therapeutic potential of RBN-2397 as a novel inhibitor of PARP7 which aims to restore Type I interferon signaling in tumors and antitumor immunity. Our distinctive approach of targeting stress support pathways is a promising novel strategy for treating multiple types of cancer,” said Victoria Richon, Ph.D., President and Chief Executive Officer, Ribon Therapeutics. “We are encouraged that the data being shared show that RBN-2397 has been well tolerated with evidence of target engagement in the dose escalation portion of our Phase 1 trial and we look forward to providing future updates as the program advances in the clinic.”

The data will be presented as follows:

Abstract Title: A first-in-human phase 1 study of a novel PARP7 inhibitor RBN-2397 in patients with advanced solid tumors
Session Date & Time: Friday, June 4, 2021 at 11:00 a.m. ET
Session Title: Developmental Therapeutics—Molecularly Targeted Agents and Tumor Biology
Presenter: Gerald S. Falchook, M.D., Director, Drug Development, Sarah Cannon Research Institute at HealthONE, Denver, CO and Clinical Investigator in the RBN-2397 Phase 1 trial
Abstract ID: 3000
Summary:

• Targeting cytosolic nucleic acid sensing pathways and the Type I interferon (IFN) response is an emerging therapeutic strategy in oncology. PARP7 is a member of the monoPARP class of enzymes and a newly identified negative regulator of nucleic acid sensing in tumor cells. PARP7 expression is increased by cellular stress and aromatic hydrocarbons, and the PARP7 gene is amplified in multiple cancers. RBN-2397 is a potent, selective inhibitor of PARP7. To date, RBN-2397 is well tolerated and demonstrates dose dependent increases in plasma exposures, evidence of target inhibition and preliminary signs of clinical activity.

About RBN-2397
RBN-2397 is an orally available small molecule inhibitor of PARP7 that Ribon Therapeutics is developing for the treatment of solid tumors. PARP7 is upregulated in response to cellular stress, including genomic instability in cancers, and acts as a brake on the cellular stress response by negatively regulating the Type I interferon response. By inhibiting PARP7 in tumor cells, RBN-2397 has been shown to directly inhibit cellular proliferation and restore interferon signaling to stimulate an innate and adaptive antitumor immune response. RBN-2397 is currently in a Phase 1 clinical trial as a monotherapy in patients with advanced solid tumors (NCT04053673). PARP7 is overexpressed in a number of tumors, including squamous cell carcinoma of the lung, or SCCL, which represents approximately 30% of all non-small cell lung cancers.

About Ribon Therapeutics
Ribon Therapeutics is a clinical stage biotechnology company developing therapeutics targeting novel enzyme families activated under cellular stress conditions that contribute to disease. We are exploring novel areas of biology to develop effective treatments for patients with limited therapeutic options. Leveraging our proprietary BEACON⁺ (Blocking the Enzyme Activity Component of NAD⁺) platform, we are building a pipeline of selective, small molecule inhibitors to numerous NAD⁺-utilizing enzymes, beginning with monoPARPs, which have applications across multiple therapeutic areas. Our lead program is RBN-2397, a PARP7 inhibitor in clinical development for the treatment of cancer. Ribon is located in Cambridge, Massachusetts. For more information visit www.RibonTx.com.

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