BUFFALO, NY--(Marketwire - November 23, 2009) - Cleveland BioLabs, Inc. (NASDAQ: CBLI) today announced the opening of enrollment for the second human safety study for CBLB502, a drug under development for the treatment of Acute Radiation Syndrome (ARS).

CBLB502 is being developed by Cleveland BioLabs under the U.S. Food and Drug Administration's Animal Efficacy Rule to treat Acute Radiation Syndrome (ARS) or radiation poisoning from any exposure to radiation such as a nuclear or radiological weapon / dirty bomb, or from a nuclear accident. This approval pathway requires demonstration of efficacy in representative animal models and safety and drug metabolism testing in healthy human volunteers.

Evidence of CBLB502's mechanism of action and activity in animal models was published in Science Magazine in April 2008 (Science, 2008, vol. 320, pp. 226-230). Data from 50 subjects in an initial Phase I safety and tolerability study indicated that CBLB502 was well tolerated and that normalized biomarker results corresponded to previously demonstrated activity in animal models of ARS.

This second safety study will include a total of 100 healthy volunteers randomized among four dosing regimens of CBLB502. The first dosing regimen will be a single injection of 25µg of CBLB502. The second dosing regimen will be a single injection of 35µg of CBLB502. The third dosing regimen will include administration of 400mg of Ibuprofen 30 minutes prior to a 35µg dose of CBLB502. The fourth dosing regimen will include two 30µg doses of CBLB502 administered 72 hours apart.

Participants in the study will be assessed for adverse side effects and blood samples will be obtained to assess the effects of CBLB502 on various biomarkers. Dosing of this study is currently projected to take approximately six to eight weeks, once started. The primary objectives of this study are to finalize a single dose to take forward into a pivotal safety study in a larger group of healthy volunteers and gather additional data on safety, PK, cytokine biomarkers in a larger and broader subject population.

About Cleveland BioLabs, Inc.

Cleveland BioLabs, Inc. is a drug discovery and development company leveraging its proprietary discoveries around programmed cell death to develop treatments for cancer and protection of normal tissues from exposure to radiation and other stresses. The Company has strategic partnerships with the Cleveland Clinic, Roswell Park Cancer Institute, ChemBridge Corporation and the Armed Forces Radiobiology Research Institute. To learn more about Cleveland BioLabs, Inc., please visit the company's website at http://www.cbiolabs.com.

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements reflect management's current expectations, as of the date of this press release, and involve certain risks and uncertainties. The Company's actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors. Some of the factors that could cause future results to materially differ from the recent results or those projected in forward-looking statements include the "Risk Factors" described in the Company's periodic filings with the Securities and Exchange Commission.