title: Quantification of HIV-1 RNA during antiretroviral therapy: association with viral phenotype and development of resistance.
abstract: The aim of this study was to analyse the interplay between the treatment responses, as assessed by serum HIV-1 RNA levels and CD4 cell counts, virological phenotype and the development of phenotypic and genotypic resistance. A total of 47 late-stage, HIV-1-infected, antiretroviral-naive patients treated with reverse transcriptase inhibitors (zidovudine or didanosine monotherapy or alternating zidovudine and didanosine) as part of a randomized study and remaining on treatment for a minimum of 1 year were included in the study. Baseline serum HIV-1 RNA levels did not differ between the patients harbouring syncytium-inducing (SI) virus and those harbouring non-syncytium-inducing (NSI) virus (P = 0.66), despite the fact that the group of patients with SI virus had a significantly lower median CD4 cell count (P < 0.00005) and a higher proportion of patients diagnosed with AIDS at study entry (11/19 versus 6/25) than did the group with NSI virus. The patients harbouring SI virus had significantly faster clinical progression than that of the patients harbouring NSI virus (P < 0.001). The patients wit
authors.affiliation: Department of Infectious Diseases, Rigshospitalet, Copenhagen, Denmark.
authors.forename: T L
authors.initials: TL
authors.lastname: Katzenstein
authors.forename: C
authors.initials: C
authors.lastname: Nielsen
authors.forename: L
authors.initials: L
authors.lastname: Bruun
authors.forename: L R
authors.initials: LR
authors.lastname: Mathiesen
authors.forename: C
authors.initials: C
authors.lastname: Pedersen
authors.forename: J
authors.initials: J
authors.lastname: Gerstoft
mesh_terms: D019380:Anti-HIV Agents / Q000494:pharmacology*; D018791:CD4 Lymphocyte Count; D003062:Codon; D004352:Drug Resistance, Microbial; D015497:HIV-1 / Q000187:drug effects* / Q000235:genetics; D006801:Humans; D009154:Mutation; D010641:Phenotype; D012367:RNA, Viral / Q000097:blood*
chemical_list: D019380:Anti-HIV Agents; D003062:Codon; D012367:RNA, Viral