Next Generation Deep Sequencing to Evaluate Viral Tropism in HIV-1 Patients Exposed to Maraviroc Add-On Therapy for 8 Days *Rachel A. McGovern, Art F.Y.

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Next Generation Deep Sequencing to Evaluate Viral Tropism in HIV-1 Patients Exposed to Maraviroc Add-On Therapy for 8 Days *Rachel A. McGovern, Art F.Y. Poon, Manuel Leal, Miguel Genebat, Ezequiel Ruiz-Mateos, P. Richard Harrigan Poster #TUPDA0102

Background The Maraviroc Clinical Test (MCT) evaluates virological response following 8 days of exposure to MVC add-on therapy 27 MCT patients were followed longitudinally by 454 sequence analysis Sequences were interpreted by Geno2Pheno coreceptor algorithm (3.5 FPR cutoff); >2% X4 virus was considered non-R5 Analyses were conducted to identify any association between the degree of viral suppression and g2p score R5 X4 Maraviroc X

In those screened non-R5 by genotype MVC inhibited R5 virus, however the overall pVL remained fairly constant as non-R5 virus took over the population within 8 days. B) Screened non-R5 by deep sequencing A) Screened R5 by deep sequencing

Maraviroc exposure in patients with non-R5 virus led to strong selection for virus with an extremely low FPR In Summary patients with non-R5 virus, when exposed to short-term maraviroc add-on therapy, demonstrated a strong selection for X4 variants having extremely low g2P scores (0 ≤ FPR < 2) in as few as 8 days. False Positive Rate Relative Fitness in the Presence of Maraviroc B) Screened non-R5 (3.4% X4) A)