Summit Therapeutics to Present at the Stifel 2024 Targeted Oncology Forum

Summit Therapeutics Inc. (NASDAQ: SMMT) (“Summit,” “we,” or the “Company”) today announced that it will participate in and present at the Stifel 2024 Targeted Oncology Forum, which will be held virtually April 16-17, 2024. Dr. Maky Zanganeh, Chief Executive Officer and President, Robert W. Duggan, Chairman and Chief Executive Officer, Manmeet Soni, Chief Operating Officer & Chief Financial Officer, Dave Gancarz, Chief Business & Strategy Officer, and Dr. Allen S. Yang, Chief Medical Officer, will participate in a fireside chat on behalf of our organization surrounding the development of our innovative investigational bispecific antibody, ivonescimab, on Tuesday April 16, 2024 at 2:30pm ET.

The presentation will be available live from our website: www.smmttx.com. An archived version will be available on our website following the presentation.

About Ivonescimab

Ivonescimab, known as SMT112 in Summit’s license territories, the United States, Canada, Europe, and Japan, and as AK112 in China and Australia, is an investigational, novel, potential first-in-class bispecific antibody combining the effects of immunotherapy via a blockade of PD-1 with the anti-angiogenesis effects associated with blocking VEGF into a single molecule. Ivonescimab displays cooperative binding with each of its intended targets with higher affinity when in the presence of both PD-1 and VEGF.

This could differentiate ivonescimab as there is potentially higher expression (presence) of both PD-1 and VEGF in tumor tissue and the tumor microenvironment (TME) as compared to normal tissue in the body. Ivonescimab’s tetravalent structure (four binding sites) enables higher avidity (accumulated strength of multiple binding interactions) in the tumor microenvironment with over 18-fold increased binding affinity to PD-1 in the presence of VEGF in vitro, and over 4-times increased binding affinity to VEGF in the presence of PD-1 in vitro (Zhong, et al, SITC, 2023). This tetravalent structure, the intentional novel design of the molecule, and bringing these two targets into a single bispecific antibody with cooperative binding qualities have the potential to direct ivonescimab to the tumor tissue versus healthy tissue. The intent of this design is to improve upon previously established efficacy thresholds, in addition to side effects and safety profiles associated with these targets.