CytRx Corporation Announces Publication Of Major Article Demonstrating That Its Proprietary Drug Target RIP140 Controls Insulin Sensitivity And Glucose Tolerance

LOS ANGELES, Feb. 2 /PRNewswire-FirstCall/ -- CytRx Corporation today announced publication of a significant research article that highlights for the first time that RIP140 suppression by small interfering RNA (siRNA) in cell culture or by gene-deletion in mice enhances glucose tolerance and insulin responsiveness. This CytRx-supported research further bolsters the potential utility of CytRx's RNAi therapeutics development program that is designed to silence RIP140 as a treatment for obesity and type 2 diabetes. CytRx has exclusive rights to intellectual property covering a drug screening method targeting RIP140, a nuclear hormone corepressor that regulates fat accumulation.

The article, entitled "Suppression of oxidative metabolism and mitochondrial biogenesis by the transcriptional corepressor RIP140 in mouse adipocytes," was published in the January 2006 issue of The Journal of Clinical Investigation. Michael P. Czech, PhD, professor and chair of molecular medicine at the University of Massachusetts Medical School (UMMS) and Malcolm Parker, FMedSci of Imperial College London, are the principle authors of the article. CytRx is developing potential RNAi therapeutics based on Drs. Czech and Parker's discovery as part of its exclusive license agreements with UMMS and Imperial Innovations Ltd., a subsidiary company of Imperial College London that provides business development and technology transfer services.

"This important research published in a highly regarded peer-reviewed journal extends upon earlier work by Drs. Czech and Parker that demonstrated the critical role of RIP140 in obesity, and serves to further validate RIP140 as an important drug target for type 2 diabetes," said Steven A. Kriegsman, President and CEO of CytRx. "Furthermore, this publication substantiates the value of our RNAi platform technology for the discovery of novel drug targets, as RIP140 is one of the protein targets identified by the proprietary screening technology that we've licensed from UMMS. By working with these distinguished scientific advisors, and applying our internal discovery program to advance RNAi therapeutics targeting RIP140, we want to rapidly complete the remaining pre-clinical tests that, if successful, would allow us to advance a RIP140 therapeutic into the clinic."

Dr. Czech, who also serves as Chairman of the CytRx Metabolic Scientific Advisory Board, added, "Our paper reports that depletion of RIP140 in vivo can improve responsiveness to insulin under circumstances such as a high-fat diet, where normal animals develop insulin resistance and type 2 diabetes. We are encouraged that our results indicate that RIP140 appears to be an ideal target for developing RNAi therapeutics to treat obesity and type 2 diabetes."

Obesity has reached epidemic proportions. The World Health Organization (WHO) reports that worldwide more than 1 billion adults are overweight and at least 300 million of them are clinically obese. WHO cites overweight and obesity as major contributors to the growing incidence of chronic diet-related diseases and disabilities, including type 2 diabetes, cardiovascular disease, hypertension and stroke, and certain forms of cancer. According to the Journal of the American Medical Association, obesity-related deaths rose 33% to an estimated 400,000 between 1990 and 2000. A recent Rand study found that by 2020, approximately one in five healthcare dollars spent on people aged 50 to 70 will be due to obesity-related disabilities, if the current trend of overeating and inactivity continues.

About CytRx Corporation

CytRx Corporation is a biopharmaceutical research and development company engaged in the development of products. The Company owns three clinical-stage compounds based on its small molecule "molecular chaperone" co-induction technology, as well as a targeted library of 500 small molecule drug candidates that may be used to screen for new drug candidates. CytRx has initiated a Phase II clinical trial with its lead small molecule product candidate arimoclomol for the treatment for amyotrophic lateral sclerosis (ALS or Lou Gehrig's disease). Arimoclomol has received Orphan Drug and Fast Track designation from the U.S. Food and Drug Administration. CytRx has previously announced that a novel HIV DNA + protein vaccine exclusively licensed to CytRx and developed by researchers at UMMS and Advanced BioScience Laboratories, and funded by the National Institutes of Health, demonstrated very promising interim Phase I clinical trial results that indicate its ability to produce potent antibody responses with neutralizing activity against multiple HIV viral strains. For more information, visit CytRx's Web site at www.cytrx.com.

About the University of Massachusetts Medical School

The University of Massachusetts Medical School, one of the fastest growing academic health centers in the country, has built a reputation as a world-class research institution, consistently producing noteworthy advances in clinical and basic research. The Medical School attracts more than $174 million in research funding annually, 80% of which comes from federal funding sources. Research funding enables UMMS scientists to explore human disease from the molecular level to large-scale clinical trials. Basic and clinical research leads to new approaches for diagnosis, treatment and prevention of disease. Visit www.umassmed.edu for additional information.

About Imperial Innovations Ltd.

Imperial Innovations is one of the United Kingdom's leading technology commercialization companies, having created over 54 spin-out companies and concluded 100 licence agreements. Imperial Innovations is committed to the creating of wealth for its shareholders, and the company's mission to match the outstanding quality of research at Imperial College London with excellence in technology transfer.

About Imperial College London

Consistently rated in the top three UK university institutions, Imperial College London is a world leading science-based university whose reputation for excellence in teaching and research attracts students (11,000) and staff (6,000) of the highest international quality. Innovative research at the College explores the interface between science, medicine, engineering and management and delivers practical solutions that enhance the quality of life and the environment -- underpinned by a dynamic enterprise culture. Website: www.imperial.ac.uk

Forward-Looking Statements

This press release may contain forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended. Examples of such statements include, but are not limited to, statements relating to the expected timing, scope and results of our clinical development and research programs, including the initiation of clinical trials, and statements regarding the potential benefits of our drug candidates and potential drug candidates. Such statements involve risks and uncertainties that could cause actual events or results to differ materially from the events or results described in the forward-looking statements, including risks or uncertainties related to CytRx's ability to obtain capital to fund its working capital needs for its RNAi development activities, uncertainties related to the early stage of CytRx's RNAi, diabetes, obesity, cytomegalovirus and ALS research, the need for future clinical testing of any RNAi-based product candidates and small molecules that may be developed by CytRx, the significant time and expense that will be incurred in developing any of the potential commercial applications for CytRx's RNAi technology or small molecules, uncertainties related to regulatory approvals for clinical testing and the scope of the clinical testing that may be required by regulatory authorities for its molecular chaperone co-induction drug candidates, including arimoclomol, and other products, and the timing and outcomes of those tests, risks relating to the enforceability of any patents covering CytRx's products and to the possible infringement of third party patents by those products, and the impact of third party reimbursement policies on the use of and pricing for CytRx's products. Additional uncertainties and risks are described in CytRx's most recently filed SEC documents, such as its most recent annual report on Form 10-K, all quarterly reports on Form 10-Q and any current reports on Form 8-K filed since the date of the last Form 10-K. All forward-looking statements are based upon information available to CytRx on the date the statements are first published. CytRx undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

For Additional Information: CytRx Corporation University of Massachusetts Ed Umali Michael Cohen 310/826-5648 508/856-2000 eumali@cytrx.commichael.cohen@umassmed.edu Imperial Innovations Ltd.: CEOcast, Inc. Lucy Ahfong Investor Contacts: Marketing Officer Kevin Theiss (ktheiss@ceocast.com) +44 (0)20 7594 6644 Cormac Glynn (cglynn@ceocast.com) lahfong@imperial.ac.uk 212/732-4300

CytRx Corporation

CONTACT: Ed Umali of CytRx Corporation, +1-310-826-5648, eumali@cytrx.com;or Michael Cohen of University of Massachusetts, +1-508-856-2000,michael.cohen@umassmed.edu; or Lucy Ahfong, Marketing Officer of ImperialInnovations Ltd., +44 (0)20 7594 6644, lahfong@imperial.ac.uk; orInvestors, Kevin Theiss, ktheiss@ceocast.com, or Cormac Glynn,cglynn@ceocast.com, both of CEOcast, Inc., +1-212-732-4300, for CytRxCorporation

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