Abstract:
OBJECTIVES:To evaluate the benefits of therapeutic drug monitoring (TDM) in association with genotypic resistance testing and expert advice to optimize therapy in multiexperienced patients infected with HIV-1. METHODS:Patients with a viral load>1000 HIV-1 RNA copies/mL and an unchanged antiretroviral therapy regimen over the last 3 months were randomized into two groups: a genotypic group (G) and a geno-pharmacological group (GP). Treatment was selected by an expert committee according to genotypic resistance testing (the G and GP groups) and TDM (the GP group) at week 4. Treatment could be modified at each visit according to toxicity, poor virological response and TDM. Results of TDM were withheld from the G group until week 12. The primary endpoint of the study was the percentage of patients with viral load<200 copies/mL at week 12. RESULTS:A total of 134 patients were randomized in the study, with 67 in each group, and included in the intent-to-treat (ITT) analysis. At baseline, median values were as follows: viral load (log(10) copies/mL): G=4.1, GP=4.0; CD4 cell count (cells/microL): G=292, GP=294; and number of prior drugs: G=7, GP=8. The median number of resistance mutations was five in the G group [nucleoside reverse transcriptase inhibitors (NRTIs)=three; non-nucleoside reverse transcriptase inhibitors (NNRTIs)=one; protease inhibitors (PI)=one] and seven in the GP group (NRTI=four; NNRTI=two; PI=one). At week 8, treatment was adjusted according to the TDM in 13 of the 67 patients in the GP group (19%). By ITT missing equal failure analysis at week 12, and after only one intervention according to plasma concentration results, a viral load<200 copies/mL was achieved in 30 of the 67 patients (45%) in the G group and in 29 of the 67 patients (43%) in the GP group (not significant). In the multivariate analysis, only prior exposure to at least two PIs at baseline gave a poor response to subsequent antiretroviral therapy. At week 24, a viral load<200 copies/mL was achieved in 35 of the 67 patients (52%) in the G group and in 40 of the 67 patients (60%) in the GP group. CONCLUSIONS:A statistically significant benefit of using TDM was not found in this short-term study where patients appeared to be adherent. However, combining genotypic resistance testing with the use of an expert committee to monitor subsequent therapy individually in patients with multiple resistance mutations was associated with high antiviral efficacy.
journal_name
HIV Medjournal_title
HIV medicineauthors
Bossi P,Peytavin G,Ait-Mohand H,Delaugerre C,Ktorza N,Paris L,Bonmarchand M,Cacace R,David DJ,Simon A,Lamotte C,Marcelin AG,Calvez V,Bricaire F,Costagliola D,Katlama Cdoi
10.1111/j.1468-1293.2004.00234.xkeywords:
subject
Has Abstractpub_date
2004-09-01 00:00:00pages
352-9issue
5eissn
1464-2662issn
1468-1293pii
HIV234journal_volume
5pub_type
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