Agenus Botensilimab/Balstilimab Data Update in Sarcomas Selected for Oral Presentation at ESMO 2023

Immuno-oncology leader, Agenus Inc. (“Agenus”) (Nasdaq: AGEN), today announced a data update from the phase 1 expansion cohort of botensilimab (multifunctional CTLA-4 antibody) in combination with balstilimab (PD-1 antibody) for patients with advanced, refractory sarcomas has been selected for an oral presentation at the upcoming ESMO Congress, to be held October 20 – 24, 2023 in Madrid, Spain.

Presentation Details:

Abstract Title: Efficacy and safety of botensilimab (BOT) plus balstilimab (BAL) in patients (pts) with refractory metastatic sarcoma (NCT03860272)

Abstract Number: 1919MO

Presenting Author: Breelyn A. Wilky, MD, Director of Sarcoma Medical Oncology, Deputy Associate Director for Clinical Research, University of Colorado Cancer Center

Presentation Date and Time: 10/21/2023, 10:15pm – 11:45pm CEST

Data presented at the conference will be available to view in the publications section of the Agenus website (https://agenusbio.com/publications) following the ESMO Conference.

About Botensilimab

Botensilimab, an investigational multifunctional CTLA-4 antibody, is designed to extend immunotherapy benefits to "cold" tumors, which have not historically responded to standard of care or other investigational therapies. Besides binding to the CTLA-4 receptor, its Fc-enhanced structure induces a memory immune response, downregulates regulatory T cells, and activates T cells, thereby enhancing immune responses. Approximately 600 patients have been treated with botensilimab in phase 1 and phase 2 clinical trials. Botensilimab alone, or in combination with Agenus’ PD-1 antibody, balstilimab, has shown clinical responses across nine metastatic, late-line cancers. For more information about botensilimab trials, visit www.clinicaltrials.gov with the identifiers NCT05608044, NCT05630183, and NCT05529316.

About Agenus

Agenus is a leading immuno-oncology company targeting cancer and infectious diseases with a comprehensive pipeline of immunological agents. The company’s mission is to expand patient populations benefiting from cancer immunotherapy through combination approaches, using a broad repertoire of antibody therapeutics, adoptive cell therapies (through MiNK Therapeutics) and adjuvants (through SaponiQx). Agenus is headquartered in Lexington, MA. For more information, visit www.agenusbio.com or follow us on LinkedIn and Twitter @agenus_bio.

Forward Looking Statements

This press release contains forward-looking statements that are made pursuant to the safe harbor provisions of the federal securities laws, including statements relating to the use of botensilimab and balstilimab, for instance, statements regarding therapeutic benefit and efficacy, mechanism of action (including validation of mechanism of action), potency, durability, and safety profile (including the absence of specific toxicities) of the Company’s therapeutic candidates; and any other statements containing the words "may," "believes," "expects," "anticipates," "hopes," "intends," "plans," "forecasts," "estimates," "will," “establish,” “potential,” “superiority,” “best in class,” and similar expressions are intended to identify forward-looking statements. These forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially. These risks and uncertainties include, among others, the factors described under the Risk Factors section of our most recent Quarterly Report on Form 10-Q or Annual Report on Form 10-K filed with the Securities and Exchange Commission. Agenus cautions investors not to place considerable reliance on the forward-looking statements contained in this release. These statements speak only as of the date of this press release, and Agenus undertakes no obligation to update or revise the statements, other than to the extent required by law. All forward-looking statements are expressly qualified in their entirety by this cautionary statement.

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