Response to vicriviroc in treatment-experienced subjects, as determined by an enhanced-sensitivity coreceptor tropism assay: reanalysis of AIDS clinical trials group A5211.

Su Z, Gulick RM, Krambrink A, Coakley E, Hughes MD, Han D, Flexner C, Wilkin TJ, Skolnik PR, Greaves WL, Kuritzkes DR, Reeves JD.

J Infect Dis. 2009 Dec 1;200(11):1724-8. doi: 10.1086/648090.

The enhanced-sensitivity Trofile assay (Monogram Biosciences) was used to retest coreceptor use at both study screening and study entry for 118 treatment-experienced subjects in AIDS Clinical Trials Group A5211 who had CCR5-tropic (R5) virus detected by the original Trofile assay at study screening. Among 90 recipients of vicriviroc, a significantly (P< .001) greater mean reduction in HIV-1 RNA was observed in 72 subjects with R5 virus versus 15 subjects reclassified as having dual/mixed-tropic viruses at screening: -1.11 versus -0.09 log(10) copies/mL at day 14 and -1.91 versus -0.57 log(10) copies/mL at week 24, respectively. Results suggest that the enhanced-sensitivity assay is a better screening tool for determining patient eligibility for CCR5 antagonist therapy.

PMID: 19874179

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.