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Drug resistance genotypes predict response to amprenavir-containing regimens in highly drug-experienced HIV-1-infected patients

journal contribution
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 Programme
We 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 Therapy

ISSN

1359-6535

Publisher

International Medical Press

Issue

4

Volume

8

Page range

301-8

Department affiliated with

  • BSMS Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-21

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