Navidea Biopharmaceuticals Announces Patent Extension for Lymphoseek®

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 on November 23, 2018 the U.S. Food and Drug Administration ("FDA”) released a letter to the U.S. Patent and Trademark Office ("USPTO”) indicating that the USPTO is allowed to extend the patent duration of U.S. patent 6,409,990 for an additional 5 years or until May 12, 2025.

This patent claims Lymphoseek® (technetium (Tc 99m) tilmanocept) and has been exclusively licensed with varying geographical and medical indication coverages to Cardinal Health and Navidea. Allowance of this patent extension will permit Cardinal Health and Navidea to extend their exclusive rights to manufacture and commercialize Lymphoseek until the end of the extended patent term in 2025.

"I am pleased the FDA has taken positive action to extend the Lymphoseek patent until May 12, 2025,” said Jed Latkin, CEO of Navidea. "We are excited that this extension allows us to continue advancing the science as Navidea prepares for the many other indications for which Tilmanocept can be used.”

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. The development activities of the Manocept immunotherapeutic platform are being conducted by Navidea in conjunction with its subsidiary, Macrophage Therapeutics, Inc. 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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