Resistance to the HIV Protease Inhibitor Amprenavir In Vitro and in Clinical Studies

Amprenavir (APV) is a highly active and selective HIV protease inhibitor (PI) that is used for the treatment of HIV infection in adults and children. In this review we present data from extensive resistance studies undertaken during the development of amprenavir. These include in vitro and clinical studies where the phenotype and genotype of HIV protease was determined after treatment with amprenavir either as the single PI [alone or with nucleoside reverse transcriptase inhibitors (NRTIs)] or in combination with other PIs. In addition, cross-resistance with other PIs has been examined to help position use of amprenavir in the clinic.