On June 11, 2015 BIND Therapeutics, a subsidiary of Navidea Biopharmaceuticals reported they have entered into a research collaboration to engineer Accurins with the Manocept targeting platform that enables selective, efficient binding to CD206 positive disease-associated macrophages (Press release, Navidea Biopharmaceuticals, JUN 11, 2015, View Source;p=RssLanding&cat=news&id=2058494 [SID:1234505428]). Upon achievement of proof-of-concept, the companies anticipate expanding the collaboration to develop Manocept-linked Accurins as a novel, potent approach to impact the tumor microenvironment which, in many forms of cancer, is a barrier to immune effector cells.
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"This collaboration represents a potentially significant advance in the evolution of our platform as we develop Accurins with novel targeting ligands," said Andrew Hirsch, president and chief executive officer of BIND Therapeutics. "The modular nature of our platform offers multiple therapeutic possibilities, and our collaboration with Macrophage Therapeutics may enable the development of Accurins that target activated macrophages, which in cancer, help create an immunosuppressive microenvironment. We believe the clinically validated Manocept platform, with its unique ability to seek out activated macrophages, fits into our vision to engineer Accurins that have a profound impact on the treatment of diseases, including our current focus in cancer."
Disease-associated macrophages generally play a pro-tumoral role and are immunosuppressive, preventing the immune system from mounting an attack on tumor cells. Based on the expression of CD206 mannose receptors on disease-associated macrophages, BIND and Macrophage plan to conduct joint research to develop a CD206 targeted Accurin nanoparticle that is capable of concentrating various therapeutic payloads to the tumor microenvironment.
"We are pleased to work with BIND Therapeutics to explore the therapeutic potential of our two complementary technology platforms," said Michael M. Goldberg, M.D., CEO of Macrophage Therapeutics and Director of Navidea. "The Manocept platform is the basis for the FDA-approved CD206 targeted sentinel lymph node detection agent, Lymphoseek (technetium Tc 99m tilmanocept) injection. Coupled with BIND’s specifically engineered Accurins that concentrate therapeutic payloads to extracellular and intracellular compartments, with a tunable controlled-release profile, we are optimistic that we can create a wide range of therapeutic applications."
"It is well-established that macrophages play an important role in many disease states but it has proven difficult to selectively target and alter macrophages that play a key role in disease progression," said Hagop Youssoufian, M.Sc., M.D., chief medical officer at BIND Therapeutics. "By coupling Accurins with Macrophage’s well-credentialed CD206 targeting ligand, we may be able to treat macrophage-mediated diseases through increased uptake, and concentration, of targeted therapeutic payloads in the tumor microenvironment. BIND’s Medicinal Nanoengineering platform is able to combine multiple molecular components into a targeted, long-circulating Accurin. An Accurin nanoparticle that binds to CD206 positive macrophages could be a valuable asset in the armament against multiple cancers and disease states."
"The collaboration furthers our vision to develop therapeutic applications of the Manocept platform through strategic partnerships," said Rick Gonzalez, president and CEO of Navidea. "In collaborating with BIND, we will be able to leverage their accomplished R&D team who has strong track record for advancing targeted nanoparticles from concept into the clinic."
About Accurins
Accurins, a new class of targeted therapeutics developed using BIND’s Medicinal Nanoengineering platform, are nanoparticles engineered to have a profound impact on the treatment of disease. The elegant and novel design of Accurins allow for prolonged circulation, controlled and tunable release and selective targeting of a therapeutic payload to diseased tissue or cells while avoiding immune surveillance detection and systemic toxicities.
Accurins can be engineered for multiple therapeutic applications and have the potential to integrate numerous payloads, including highly potent drugs with mechanism-based toxicities that limit therapeutic benefit, DNA, RNA, proteins and immunotherapy agents. This attribute enables Accurins to target multiple diseases, including cancer, inflammatory, vascular, and infectious disease.
About Manocept CD206 Targeting Platform for Therapeutics Development
Manocept CD206 Targeting Platform is a proprietary mannose-containing, receptor-directed technology platform designed to engineer novel, synthetic receptor targeted imaging agents and therapeutics for cancer and other diseases. Manocept’s unique structural and molecular properties enable the design of novel immuno-constructs that selectively target and bind to CD206 (mannose receptor) and other C-type Lectins found on activated, disease-associated macrophages and tumor associated macrophages (TAMs). The Manocept CD206 Targeting Platform provides a novel and valuable approach to the design of drug molecules targeting CD206 disease-associated macrophages for therapeutic purposes.
About Lymphoseek
Lymphoseek (technetium Tc 99m tilmanocept) injection is the first and only FDA-approved receptor-targeted lymphatic mapping agent. It is a novel, receptor-targeted, small-molecule radiopharmaceutical used in the evaluation of lymphatic basins that may have cancer involvement in patients. Lymphoseek is designed for the precise identification of lymph nodes that drain from a primary tumor, which have the highest probability of harboring cancer. Lymphoseek is approved by the U.S. Food and Drug Administration (FDA) for use in solid tumor cancers where lymphatic mapping is a component of surgical management and for guiding sentinel lymph node biopsy in patients with clinically node negative breast cancer, melanoma or squamous cell carcinoma of the oral cavity. Lymphoseek has also received European approval in imaging and intraoperative detection of sentinel lymph nodes in patients with melanoma, breast cancer or localized squamous cell carcinoma of the oral cavity.
Accurate diagnostic evaluation of cancer is critical, as it guides therapy decisions and determines patient prognosis and risk of recurrence. Overall in the U.S., solid tumor cancers may represent up to 1.2 million cases per year. The sentinel node label in the U.S. and Europe may address approximately 235,000 new cases of breast cancer, 76,000 new cases of melanoma and 45,000 new cases of head and neck/oral cancer in the U.S., and approximately 367,000 new cases of breast cancer, 83,000 new cases of melanoma and 55,000 new cases of head and neck/oral cancer diagnosed in Europe annually.
Lymphoseek Indication and Important Safety Information
Lymphoseek is a radioactive diagnostic agent indicated with or without scintigraphic imaging for:
Lymphatic mapping using a handheld gamma counter to locate lymph nodes draining a primary tumor site in patients with solid tumors for which this procedure is a component of intraoperative management.
Guiding sentinel lymph node biopsy using a handheld gamma counter in patients with clinically node negative squamous cell carcinoma of the oral cavity, breast cancer or melanoma.
Important Safety Information
In clinical trials with Lymphoseek, no serious hypersensitivity reactions were reported, however Lymphoseek may pose a risk of such reactions due to its chemical similarity to dextran. Serious hypersensitivity reactions have been associated with dextran and modified forms of dextran (such as iron dextran drugs).
Prior to the administration of Lymphoseek, patients should be asked about previous hypersensitivity reactions to drugs, in particular dextran and modified forms of dextran. Resuscitation equipment and trained personnel should be available at the time of Lymphoseek administration, and patients observed for signs or symptoms of hypersensitivity following injection.
Any radiation-emitting product may increase the risk for cancer. Adhere to dose recommendations and ensure safe handling to minimize the risk for excessive radiation exposure to patients or health care workers.
In clinical trials, no patients experienced serious adverse reactions and the most common adverse reactions were injection site irritation and/or pain (<1%).