VIRxSYS Announces Interim Results from VRX496 Gene Therapy Phas...( Disease Altering Treatment Shows Ab...)

Disease Altering Treatment Shows Ability to Prevent HIV from Replicating

GAITHERSBURG, Md., Feb. 6 /PRNewswire/ -- VIRxSYS Corporation, a privately held company developing gene therapies for HIV and genetic diseases, presented results from its Phase II trial of VRX496, a gene therapy for the treatment of AIDS, at the 2008 Annual Conference on Retroviruses and Opportunistic Infections (CROI) in Boston, MA.

"This appears to be a significant demonstration of slowing and possibly halting the replication of the infectious HIV virus in humans," said Dr. Gary Blick, Medical Director, Circle Medical LLC. "VRX496 appears to cause wt-HIV particles to lose their envelopes and the in vivo pressure delivered by a patient's own modified cells leads to massive quasispecie reductions and production of impaired and less replicative virions. This treatment shows tremendous promise."

VRX496 has the potential to change HIV/AIDS care. Currently there are a variety of drugs available for HIV-infected patients, but all have long-term complications. To date, there have been no reported adverse events in any patient receiving VRX496 in clinical trials. In addition, VRX496 does not require daily administration.

"We are proving the effectiveness of our lentiviral vector approach in attacking HIV," said Dr. Laurent Humeau, VP of R&D for VIRxSYS. "Our lentiviral vector VRX496 appears to sustain expression of the RNA antisense targeting the HIV envelope for a long period of time, with a measurable effect on the HIV replicative fitness up to 3 years following a single injection. We believe this will prove to be an important step in the treatment of this disease."

VRX496 is a different viral vector than those used in previous gene therapy trials. VRX496 is derived from HIV-1 itself and has it disease-causing elements removed. Currently, VRX496 is being investigated as a therapeutic treatment (a treatment for those already infected with HIV). Unlike other vir
'/>"/>