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Adventrx Receives Refuse to File Letter from FDA on ANX-530 New Drug Application

SAN DIEGO, March 1 /PRNewswire-FirstCall/ -- ADVENTRX Pharmaceuticals, Inc. announced today that it received a refuse to file letter from the U.S. Food and Drug Administration (FDA) regarding its New Drug Application (NDA) for ANX-530 (vinorelbine injectable emulsion). In the letter, the FDA indicated that the data included in the initial submission from the intended commercial manufacturing site was insufficient to support a commercially-viable expiration dating period. FDA identified only the one chemistry, manufacturing and controls (CMC) reason for the refusal to file. ADVENTRX plans to meet with the FDA as soon as possible to discuss its response.

To support a commercially-viable expiration dating period, the stability data provided in the ANX-530 NDA met ICH filing requirements for a new drug. Site-specific stability data from lots manufactured at the intended commercial manufacturing site also were submitted in the NDA.

"We believed, following discussions with the FDA at a pre-NDA meeting, the stability data package included in our initial submission supported both NDA acceptance and appropriate expiration dating. However, we now expect FDA will require additional site-specific stability data to accept our application. Although we plan to discuss the particular filing requirements with the reviewing chemists, site-specific stability studies are already ongoing and our recent financings provide us the capital to continue this work and, we expect, resubmit the application," said Brian M. Culley, Chief Executive Officer at ADVENTRX.

"We will work closely with the Agency to understand its new requirements and define the path to a successful resubmission at the earliest possible time," Mr. Culley continued.

ADVENTRX submitted the NDA for ANX-530 on December 30, 2009. Based on current regulations, once an NDA is submitted to the FDA, FDA has 60 days to preliminarily review the NDA submission and assess whether the NDA is sufficiently complete to permit a substantive review. If it determines that the NDA is not sufficiently complete, the FDA issues a refuse to file letter to the applicant. ADVENTRX plans to request a meeting with the FDA as soon as possible to discuss its comments on the NDA submission and to reach an understanding on what would be required for the ANX-530 NDA to be accepted for review.

About ADVENTRX Pharmaceuticals

ADVENTRX Pharmaceuticals is a specialty pharmaceutical company whose product candidates are designed to improve the performance of existing cancer treatments by addressing limitations associated principally with their safety and use. More information can be found on the Company's web site at www.adventrx.com.

Forward Looking Statements

ADVENTRX cautions you that statements included in this press release that are not a description of historical facts are forward-looking statements that involve risks and assumptions that, if they materialize or do not prove to be accurate, could cause ADVENTRX's results to differ materially from historical results or those expressed or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to: FDA's requirements for the ANX-530 NDA to be accepted for review do not justify continued development of ANX-530; ADVENTRX's dependence on the success of ANX-530, and increased uncertainty as to whether ANX-530 will receive regulatory approval or be commercialized successfully; the potential that FDA may not accept a resubmitted ANX-530 NDA for review, or that the bioequivalence data and other information included in the ANX-530 NDA may not adequately support bioequivalence with Navelbine, including as a result of performing pharmacokinetic equivalence analyses based on a patient population other than the population on which ADVENTRX based its analysis; the potential that changes made in transferring the manufacturing process for ANX-530 may result in a lack of comparability between the commercial product and the material used in clinical trials, and that FDA may require ADVENTRX to perform additional non-clinical or clinical studies; the potential for FDA to impose other requirements to be completed before or after approval of the ANX-530 NDA; ADVENTRX's reliance on third parties to assist with its bioequivalence trials, regulatory submissions, manufacturing and other important aspects of the ANX-530 development program, and the risk that FDA approval may be delayed if their performance is found to have been substandard; the possibility that patent claims covering ANX-530 will not issue or, if they do, that such claims, which likely will be limited to a specific intravenous emulsion formulation of vinorelbine, will not be sufficient to preclude development of other formulations of vinorelbine by competitors; the risk of investigator bias in reporting adverse events as a result of the open-label nature of the ANX-530 bioequivalence study, including bias that increased the reporting of adverse events associated with Navelbine and/or that decreased the reporting of adverse events associated with ANX-530; the risk that ADVENTRX will have insufficient capital to support its operations during the FDA review of the ANX-530 NDA, including as a result of FDA requesting or ADVENTRX providing additional information or clarification with respect to such submission or the FDA not completing its review by the ANX-530 "PDUFA date," should a resubmitted ANX-530 be accepted; the risk that ADVENTRX will pursue development activities at levels or on timelines, or will incur unexpected expenses, that shortens the period through which its operating funds will sustain it; the risk that ADVENTRX will be unable to raise sufficient additional capital to commercialize ANX-530, if the ANX-530 NDA is approved; and other risks and uncertainties more fully described in ADVENTRX's press releases and periodic filings with the Securities and Exchange Commission. ADVENTRX's public filings with the Securities and Exchange Commission are available at www.sec.gov.

You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date when made. ADVENTRX does not intend to revise or update any forward-looking statement set forth in this press release to reflect events or circumstances arising after the date on which it was made.

Source: ADVENTRX Pharmaceuticals, Inc.

CONTACT: Brian Culley, Chief Executive Officer of ADVENTRX Pharmaceuticals, +1-858-552-0866; or Investors, Don Markley of Lippert/Heilshorn & Associates, Inc., +1-310-691-7100, dmarkley@lhai.com, for ADVENTRX Pharmaceuticals

Web Site: http://www.adventrx.com/

Posted: March 2010

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