ABCB1 allele polymorphism is associated with virological efficacy in naïve HIV-infected patients on HAART containing nonboosted PIs but not boosted PIs.
OBJECTIVE
To assess the effect of the multidrug resistance-1 single nucleotide polymorphism (ABCB1 SNP) C3435T in exon 26 on the virological responses to first-line protease inhibitor (PI)-containing HAART regimens.


METHODS
A cohort of 182 HIV-infected patients with a PI-containing HAART regimen initiated from 1997 to 2004 was enrolled. Time to the first indetectable viral load (VL) was determined in patients with the CC, CT, or TT genotype.


RESULTS
There were 37%, 44%, and 19% of patients who had the CC, CT and TT genotypes, respectively. The median estimated times to VL indetectability in the CC, CT, and TT groups were respectively 5.9, 3.9, and 4.8 months (p= .06). In patients on a non-boosted PI regimen, ABCB1 genotype was associated with time to VL indetectability that was shorter in patients with the CT than CC genotype (CT vs. CC, hazard ratio [HR]=0.62, p= .02; TT vs. CC, HR= 0.72, p= .21). This association was not found in patients with first-generation boosted PI-containing regimens and especially not with second-generation boosted PI-containing regimens.


CONCLUSIONS
Our results show that the ABCB1 SNP in exon 26 is associated with virological efficacy in HIV-infected patients treated with non-boosted PI-containing regimens but not with those containing boosted PIs, particularly of the second generation.
Infectious Diseases Department, Tourcoing Hospital, Tourcoing, France. xdelatribonniere@cegetel.net
X
X
de la Tribonnière
F
F
Broly
S
S
Deuffic-Burban
L
L
Bocket
F
F
Ajana
N
N
Viget
H
H
Melliez
Y
Y
Mouton
Y
Y
Yazdanpanah
D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics*; D000328:Adult; D023241:Antiretroviral Therapy, Highly Active; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D015658:HIV Infections / Q000188:drug therapy* / Q000235:genetics*; D017320:HIV Protease Inhibitors / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D016896:Treatment Outcome
C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D017320:HIV Protease Inhibitors