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Drug resistance genotypes predict response to amprenavir-containing regimens in highly drug-experienced HIV-1-infected patients
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posted on 2023-06-08, 10:44 authored by Martin Fisher, Caroline A Sabin, Ed Wilkins, Maurice Murphy, Annemiek de Ruiter, Philippa J Easterbrook, Clifford Leen, Emmanuel Vlahakis, Patricia A Cane, Xu Li, Deenan Pillay, UK Expanded Access Amprenavir ProgrammeWe have undertaken a study of virological responses to amprenavir-containing antiretroviral regimens, during the expanded access programme within the UK. Ninety-five HIV-1-infected patients were included for which virological and immunological follow-up was available for 75, and baseline drug resistance data available for 51. These were highly drug-experienced patients, having previously received a median of nine antiviral drugs, within all available classes. Eighty-eight percent of patients had a virological response to the new regimen, with a median maximal decline of 1.45 log10 copies/ml, and 34% of patients reached <400 copies/ml on treatment. Although 68% of patients with resistance data had protease inhibitor resistance mutations, only 10% patients had key amprenavir resistance mutations, and virological response was predicted by the number of active drugs utilized in the amprenavir-containing regimen, as determined by the baseline genotypic resistance test. Other independent predictors of viral load decline were a higher baseline viral load and fewer previous antiviral drugs. We conclude that amprenavir can contribute to antiviral efficacy in salvage regimens, and that resistance testing may help to optimize its use in this scenario. New formulations of amprenavir, together with boosted regimens, may enhance the activity in the presence of protease inhibitor-resistant virus.
History
Publication status
- Published
Journal
Antiviral TherapyISSN
1359-6535Publisher
International Medical PressIssue
4Volume
8Page range
301-8Department affiliated with
- BSMS Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-21Usage metrics
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