Navidea Biopharmaceuticals Announces the Notice of Allowance for U.S. Patent Application for Key Component of the Company’s Cancer Immunotherapy Pipeline

Targeted therapeutics designed to alter the behavior of macrophages to rally the body’s immune response against tumors

Navidea Biopharmaceuticals, Inc. (NYSE American: NAVB) (“Navidea” or the “Company”), a company focused on the development of precision immunodiagnostic agents and immunotherapeutics, today announced that it has received a Notice of Allowance from the U.S. Patent and Trademark Office for its patent application titled, “Compositions And Methods For Altering Macrophage Phenotype (US Application #16/832,620).” Broadly, this patent covers the ability of Navidea’s constructs to stimulate the body’s immune response against tumors through targeted delivery of payloads (e.g., doxorubicin, paclitaxel, and bisphosphonates) that change the nature of macrophages to make them more proinflammatory. These constructs have demonstrated the ability to rally an immune response against tumors and make other therapies work more effectively against those tumors in preclinical studies. If confirmed in clinical trials, the ability to increase the efficacy of cancer therapeutics by harnessing the body’s immune system could bring significant benefits to patients.

The Notice of Allowance concludes the substantive examination of the patent application and is expected to result in the issuance of a U.S. patent after administrative processes are completed. When issued, this patent will protect key elements of Navidea’s cancer immunotherapy product pipeline. Navidea’s cancer immunotherapy product pipeline consists of a series of mannosylated-amine dextrans (“MADs”) that carry small molecule drug payloads that are attached to MADs by degradable linkers. The MADs bind to CD206 receptors on tumor associated macrophages (“TAMs”) and related cells such as dendritic cells and myeloid derived suppressor cells. The degradable linkers are designed to release their small molecule payloads inside the CD206 expressing cells. The small molecule payloads are designed to induce proinflammatory behaviors in these cells.

In tumors, TAMs and their cellular relatives create an immunosuppressive tumor environment that prevents other types of immune cells from attacking cancer cells, thus permitting cancer cells to survive and grow. In addition, this immunosuppressive tumor environment decreases the effectiveness of a wide variety of other cancer therapies, including other cancer immunotherapies. Navidea’s MAD-based cancer immunotherapies alter the behavior of macrophages to make them less immunosuppressive and more proinflammatory, or antitumor. Studies in mouse models of cancer have shown that Navidea’s MAD-based immunotherapies can enhance the effectiveness of other cancer immunotherapies and significantly reduce tumor growth. The results of these studies have been presented at the New York Academy of Sciences (2021), the Tumor Myeloid-Directed Therapies meeting (2022), and at the 2022 annual meeting of the Society for Immunotherapy of Cancer.

Dr. Michael Rosol, Chief Medical Officer for Navidea, said, “We are excited about this development that significantly improves our valuable therapeutics intellectual property and strategic partnership potential. This important patent application covers key intellectual property critical to the continued development of our therapeutics pipeline. Our targeted cancer immunotherapeutics have the potential to address the large unmet medical need in oncology, improve the lives of a great number of individuals, and bring significant value to Navidea’s shareholders.”

About Navidea

Navidea Biopharmaceuticals, Inc. (NYSE American: NAVB) is a biopharmaceutical company focused on the development of precision immunodiagnostic agents and immunotherapeutics. Navidea is developing multiple precision-targeted products based on its Manocept platform to enhance patient care by identifying the sites and pathways of disease and enable better diagnostic accuracy, clinical decision-making, and targeted treatment. Navidea’s Manocept platform is predicated on the ability to specifically target the CD206 mannose receptor expressed on activated macrophages. The Manocept platform serves as the molecular backbone of Tc99m tilmanocept, the first product developed and commercialized by Navidea based on the platform. Navidea’s strategy is to deliver superior growth and shareholder return by bringing to market novel products and advancing the Company’s pipeline through global partnering and commercialization efforts. For more information, please visit www.navidea.com.

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