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Gilead Sciences’ long-acting HIV drug gets European Commission approval

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A Gilead Sciences HIV drug designed for twice-yearly dosing is now approved for use in Europe, providing a new treatment option for patients whose virus no longer responds to currently available therapies.

The European Commission approval announced Monday covers use of the drug, lenacapavir, in combination with other antiretrovirals in adults with HIV. The drug, which patients start with an oral dose before proceeding to the long-acting injection, will be marketed under the brand name Sunlenca.

Though HIV/AIDS has no cure, antiretroviral therapy can keep the virus in check and give the immune system a chance to recover. Antiviral drugs work by addressing part of a virus’s life cycle, preventing viral replication. Whereas most antivirals target one stage of the life cycle, Foster City, California-based Gilead designed Sunlenca to block HIV at multiple stages. Furthermore, the company said that its new HIV drug has no known cross resistance with other classes of drugs currently available for treating HIV. That means it can be used in combination with other HIV drugs.

The European Commission based its decision on the results of a placebo-controlled Phase 2/3 study enrolling 72 patients whose HIV had become resistant to multiple therapies. The results showed that 83% of study participants who received the experimental Gilead drug in addition to other therapies achieved an undetectable viral load at week 52, meeting the main goal of the study. Gilead also reported that patients treated with the drug showed an increase in levels of CD4 cells, a type of immune cell whose count is used to gauge the health of the immune system in patients with HIV. The most common adverse reactions reported were nausea and injection site reactions. Results from the study were published in May in the New England Journal of Medicine.

“Lenacapavir is a unique and potent medicine with the potential for flexible dosing options,” Gilead Chairman and CEO Daniel O’Day said in a prepared statement. “Following today’s approval, it will now be the only twice-yearly treatment for people who struggle with multi-drug resistant HIV.”

The European regulatory nod is Sunlenca’s first one. The drug had run into hurdles at the FDA; in March, the U.S. agency turned down Gilead’s application for the drug due to a manufacturing issue. The regulator had questions about the compatibility of drug with the glass used in the vials. Gilead resubmitted its application in June. A regulatory decision is now expected by Dec. 27. Gilead said that additional regulatory submissions and decisions are expected later this year.

Image by Flickr user NIAID via a Creative Commons license

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