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PRESS RELEASE 2017

ELUSYS RECEIVES $16.35 MILLION FOR DELIVERY OF ANTHIM® TO U.S. GOVERNMENT

ELUSYS awarded additional $5 million to complete development of novel lyophilized form of ANTHIM

PINE BROOK, NJ, JANUARY 24, 2017 – Elusys Therapeutics, Inc. (Elusys) today announced it has received $16.35 million for completing the second delivery of ANTHIM®, (obiltoxaximab) Injection, its treatment for inhalational anthrax, as part of its $45M procurement contract to provide ANTHIM for the U.S. Strategic National Stockpile (SNS), the U.S. Government’s repository of critical medical supplies for public health emergency preparedness. The company had previously received $8M for its first delivery of ANTHIM under this same contract earlier in 2016.

ANTHIM received U.S. Food and Drug Administration (FDA) marketing approval in March 2016. ANTHIM is indicated in adult and pediatric patients for the treatment of inhalational anthrax due to Bacillus anthracis in combination with appropriate antibacterial drugs, and for prophylaxis of inhalational anthrax when alternative therapies are not available or are not appropriate. ANTHIM should only be used for prophylaxis when its benefit for prevention of inhalational anthrax outweighs the risk of hypersensitivity and anaphylaxis. The effectiveness of ANTHIM is based solely on efficacy studies in animal models of inhalational anthrax. There have been no studies of the safety or pharmacokinetics (PK) of ANTHIM in the pediatric population. Dosing in pediatric patients was derived using a population PK approach. ANTHIM does not have direct antibacterial activity. ANTHIM should be used in combination with appropriate antibacterial drugs. ANTHIM is not expected to cross the blood-brain barrier and does not prevent or treat meningitis.

Elusys also announced today that it has been awarded approximately $5M of additional funding from the Biomedical Advanced Research and Development Authority (BARDA), within the Office of the Assistant Secretary for Preparedness and Response in the U.S. Department of Health and Human Services, to continue Elusys’ lyophilization development program and regulatory activities to support a Supplemental BLA for a lyophilized form of ANTHIM. The company has now received authorized funding from BARDA totaling more than $200M under two advanced development contracts for ANTHIM.

Lyophilization (freeze drying) of the current liquid form of ANTHIM is expected to extend product shelf-life. Lyophilization also may improve tolerance of ANTHIM to extreme temperatures during shipping and field use. These improvements should enhance operational flexibility and improve life cycle management.

ANTHIM is a monoclonal antibody that binds to the protective antigen (PA) component of anthrax toxin. ANTHIM’s toxin neutralizing activity prevents entry of anthrax toxin into susceptible cells, avoiding further spread of the toxin throughout the body and the ensuing tissue damage that leads to death. ANTHIM is supplied as single-dose vials for IV infusion.

Anthrax is a life-threatening infectious disease caused by Bacillus anthracis. Cases of inhalational anthrax in humans can occur through intentional spread of B. anthracis spores as a biowarfare or bioterrorism agent. B. anthracis spores introduced through the lungs lead to inhalational anthrax, which is deadly in humans.

IMPORTANT SAFETY INFORMATION Including BOXED WARNING

WARNING: HYPERSENSITIVITY and ANAPHYLAXIS
Hypersensitivity reactions, including anaphylaxis, have been reported during ANTHIM infusion. ANTHIM should be administered in monitored settings by personnel trained and equipped to manage anaphylaxis. Stop ANTHIM infusion immediately and treat appropriately if hypersensitivity or anaphylaxis occurs.

WARNINGS AND PRECAUTIONS

Hypersensitivity and anaphylaxis have been reported during the IV infusion of ANTHIM. Due to the risk of hypersensitivity and anaphylaxis, ANTHIM should be administered in monitored settings by personnel trained and equipped to manage anaphylaxis. Monitor individuals who receive ANTHIM closely for signs and symptoms of hypersensitivity reactions throughout the infusion and for a period of time after administration. Stop ANTHIM infusion immediately and treat appropriately if hypersensitivity or anaphylaxis occurs. Pre-medication with diphenhydramine is recommended prior to administration of ANTHIM. Diphenhydramine pre-medication does not prevent anaphylaxis, and may mask or delay onset of symptoms of hypersensitivity.

ADVERSE REACTIONS

The safety of ANTHIM has been studied only in healthy volunteers. It has not been studied in patients with inhalational anthrax. The most frequently reported adverse reactions were headache, pruritus, infections of the upper respiratory tract, cough, vessel puncture site bruise, infusion site swelling, urticaria, nasal congestion, infusion site pain, and pain in extremity.

USE IN SPECIFIC POPULATIONS

Pediatric Use: There have been no studies of the safety or PK of ANTHIM in the pediatric population.

To see the complete prescribing information for ANTHIM, click here.

About Elusys Therapeutics, Inc.

Elusys Therapeutics, a private company based in Pine Brook, NJ, is focused on the development of antibody therapeutics for the treatment of infectious disease. In March 2016, the U.S. Food and Drug Administration (FDA) approved ANTHIM (obiltoxaximab) Injection (www.anthim.com), the company’s monoclonal antibody (mAb) anthrax antitoxin, for the treatment of inhalational anthrax due to Bacillus anthracis in combination with appropriate antibacterial drugs, and for prophylaxis of inhalational anthrax when alternative therapies are not available or are not appropriate. Elusys has received over $240 million in development grants and contracts from the U.S. Department of Defense (DoD), National Institutes of Health (NIH) and BARDA. Current investors include Essex Woodlands Health Ventures LLC, Invesco Private Capital, Crescendo Ventures, MedImmune Ventures and Pfizer. For more information, visit www.elusys.com.

CONTACT:

Gina Cella
Cella Communications
t: 857-239-9198
e: ginacella@comcast.net

SAFE HARBOR STATEMENT

This announcement includes statements that are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. This release includes forward-looking statements. Any statements, other than statements of historical fact, including statements regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects, plans and objectives of management, and any other statements containing the words “believes”, “expects”, “anticipates”, “plans”, “estimates” and similar expressions, are forward-looking statements. Such statements are based upon the current beliefs and expectations of management that are subject to risks, uncertainties and other important factors that could cause the company’s actual results to differ materially from those indicated by such forward-looking statements. The guidance in this presentation is only effective as of the date given and will not be updated or affirmed unless and until the Company publicly announces updated or affirmed guidance.

Elusys Receives $16.35 Million for Delivery of ANTHIM® to U.S. Government

www.anthim.com

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