Wednesday, June 22, 2016

This actually sounds promising. It's the weekly antibody injection Charlie Sheen has talked about. He actually is part of this case study.

Weekly PRO 140 Antibody Injections May Work as HIV Maintenance Therapy

June 20, 2016
Weekly injections of a monoclonal antibody known as PRO 140 may work as a stand-alone treatment for individuals living with HIV, according to a study presented at ASM Microbe 2016, in Boston.
The phase-2b study followed 39 people who were living with CCR5-tropic HIV. CCR5 is a receptor on the CD4 cell that most strains of HIV use as a point of entry. PRO 140 is able to bind to CCR5, preventing HIV infection.
The study participants achieved undetectable viral loads (below 40 copies/mL) on standard once-daily antiretroviral therapy. They were then switched to weekly subcutaneous injections of PRO 140 monotherapy. After they maintained viral suppression for 13 weeks, 16 participants were trained to self-administer the weekly injections.
"The PRO 140 treatment was well tolerated by patients with no discontinuation or drug-related adverse effects," said lead author Paul J. Maddon, M.D., Ph.D., according to the study press release. "Importantly, PRO 140 monotherapy can allow patients to avoid the potential toxicity of [antiretroviral therapy] while preserving future drug options," Maddon added.There were 15 participants included in the final results, with 86.7% male, 20% non-white, a median age of 55 years and median CD4 count of 586 cells/mm3. Out of those 15, 10 participants are still on PRO 140 monotherapy and have maintained viral suppression for almost 18 months, according to a study press release.
Three participants experienced virologic failure at a median time of 169 days. They were subsequently restarted on standard antiretroviral therapy and achieved an undetectable viral load after a median of 29 days. Additionally, one participant with an undetectable viral load discontinued the PRO 140 treatment at week 47 because of relocation.
"PRO 140 may offer a simple, long-acting, single-agent maintenance therapy after initial [antiretroviral therapy] in selected patients with HIV infection," Maddon concluded.
The researchers plan to move on to a larger phase-2b or phase-3 study.
PRO 140 is the experimental drug that the actor Charlie Sheen, who publicly disclosed his HIV status in November 2015, recently revealed he was receiving as part of a clinical trial.
Here's a video from the antibody developers showing how PRO 140 combats HIV:

Editor's note: This is a developing story and more details will be added as we receive additional information.
Warren Tong is the senior science editor for and
Follow Warren on Twitter: @WarrenAtTheBody.

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