PolyHeme

Treatment for Bleeding

Complete Response Letter for PolyHeme BLA

Northfield Receives Complete Response Letter for PolyHeme BLA

EVANSTON, Ill.--(BUSINESS WIRE)--May 1, 2009 - Northfield Laboratories Inc. announced today that it has received a complete response letter from the U.S. Food and Drug Administration pertaining to the Company's Biologic License Application for its investigational product, PolyHeme, indicated for the treatment of life-threatening hemoglobin levels when blood transfusion is indicated and red blood cells may not be available.

The letter states that FDA has completed its review of the Company's BLA and finds "that the information and data submitted are inadequate for final approval action." Specifically, FDA stated that the Company's pivotal study "¦ did not meet the pre-specified primary efficacy endpoint," and that "based on the totality of the data in the application, FDA has determined that the data submitted do not support the proposed indication."

FDA also noted that "the safety data of all controlled studies reveal that the administration of PolyHeme places the patients at a higher risk of significant adverse events," and stated that "therefore, in the absence of clinical benefit, the risk:benefit assessment of the product in trauma is unfavorable."

Northfield is evaluating FDA's response and is considering the options for the Company going forward.

About Northfield Laboratories

Northfield Laboratories is developing a hemoglobin-based oxygen-carrying red blood cell substitute, PolyHeme. PolyHeme is a solution of chemically modified human hemoglobin that requires no cross-matching and is therefore compatible with all blood types. It has an extended shelf life in excess of 12 months. For further information, visit http://www.northfieldlabs.com.

Forward Looking Statement

This press release may contain forward-looking statements concerning, among other things, Northfield's future business plans and strategies and clinical and regulatory developments affecting our PolyHeme red blood cell substitute product. These forward-looking statements are identified by the use of such terms as "intends," "expects," "plans," "estimates," "anticipates," "should," "believes" and similar terms. These forward-looking statements involve inherent risks and uncertainties. Our actual results may therefore differ materially from those predicted by the forward-looking statements because of various factors and possible events, our potential inability to obtain FDA approval to market PolyHeme commercially based on our BLA, our potential inability to obtain adequate additional capital to continue our business, our potential inability to maintain compliance with applicable Nasdaq listing standards, our potential inability to obtain adequate supplies of raw materials and to manufacture PolyHeme in commercial quantities, our potential inability to market PolyHeme successfully, the possibility that competitors will develop products that will render PolyHeme obsolete or non-competitive, our potential inability to protect our intellectual property rights, the outcome of a purported class action lawsuit as described in our most recently filed quarterly report on Form 10-Q, the possibility that we may be subject to product liability claims and other legal actions, our dependency on a limited number of key personnel, the uncertainty of third party reimbursement for our product and other risks and uncertainties described from time to time in our periodic reports filed with the Securities and Exchange Commission, including our most recently filed annual report on Form 10-K and quarterly report on Form 10-Q. These forward-looking statements speak only as of the date of this press release. We do not undertake any obligation to update or publicly release any revisions to forward-looking statements to reflect events, circumstances or changes in expectations after the time such statement is made. All subsequent written and oral forward-looking statements attributable to Northfield or any person acting on our behalf are qualified by this cautionary statement.

Posted: May 2009

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