Fostemsavir, a new experimental attachment inhibitor, suppressed viral load in over half of participants with extensive drug resistance when added to a background regimen selected by resistance testing, Max Lataillade of ViiV Healthcare reported at the 16th European AIDS Conference in Milan on Friday.
The findings come from the phase 3 BRIGHTE study carried out in the United States, France and Brazil.
Fostemsavir (formerly BMS-663068) is a new experimental HIV attachment inhibitor which binds to the HIV gp120 protein, preventing HIV attachment to CD4 cells. Other inhibitors of HIV entry, enfuvirtide and maraviroc, have limited roles in HIV treatment. Enfuvirtide is an HIV fusion inhibitor, an injectable agent that is prescribed only for patients with no other treatment options. Maraviroc is a CCR5 antagonist; it prevents HIV from using the CCR5 receptor on the surface of CD4 cells to gain entry to the cell. It is used in treatment-experienced patients.
Fostemsavir is being developed by ViiV Healthcare as an agent for use in treatment-experienced patients with resistance to several classes of antiretroviral drug. The drug was acquired from Bristol-Myers Squibb along with several other experimental antiretroviral drugs in 2016.