AEGiS-Reuters: AIDS "vaccine" fails to boost immunity in US study

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AIDS "vaccine" fails to boost immunity in US study

Reuters NewMedia - Tuesday October 31, 2000


CHICAGO, Oct 31 (Reuters) - A deactivated form of the AIDS virus designed like a vaccine to boost the immune systems of HIV-infected people failed to slow the deadly disease in a trial, and the study was aborted, researchers said on Tuesday.

In earlier testing, HIV-1 Immunogen, made under the brand name Remune by Carlsbad, California-based Immune Response Corp. (NasdaqNM:IMNR - news), had shown promise by increasing the supply of immune system CD4 cells that are targeted by the virus.

But study monitors halted the study last year, several months before the scheduled end of the largest-ever trial with Remune, because the drug failed to slow the disease's progress.

"They recommended that the study, in fact, be halted, and that the patients released from the study so they could find other ways to receive treatment," said study author James Kahn of the University of California at San Francisco. HIV-1 Immunogen, a so-called therapeutic vaccine, is an inactive form of an AIDS virus stripped of its protein envelope.

The report was published in this week's Journal of the American Medical Association.

Three-quarters of the 2,527 men participating in the study also were receiving some type of antiretroviral therapy, a cocktail of drugs proven to stave off the immune system breakdown that is the signature of AIDS.

Half the subjects received HIV-1 Immunogen, while the other half took a placebo. Over the three years of the study, 23 subjects taking the drug died, while 19 taking the harmless placebo died.

The hope of the researchers was that the drug would stimulate the immune systems of people already infected with the virus, according to the study.

"Oftentimes the immune system becomes lax in its ability to mount an effective immune response to control the virus," Kahn said. "Therefore, if you were to give it small amounts of HIV proteins, you would either reawaken or restimulate the immune system, so that it's able to mount a more effective response in controlling the person's native viral infection."

Kahn said that other promising medications may provide the needed boost to the immune system that is ultimately destroyed by AIDS.


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