Nucleoside reverse transcriptase inhibitor resistance mutations associated with first-line stavudine-containing antiretroviral therapy: Programmatic implications for countries phasing out stavudine

• Main Authors: Tang M.W., Rhee S.-Y., Bertagnolio S., Ford N., Holmes S., Sigaloff K.C., Hamers R.L., De Wit T.F.R., Fleury H.J., Kanki P.J., Ruxrungtham K., Hawkins C.A., Wallis C.L., Stevens W., Van Zyl G.U., Manosuthi W., Hosseinipour M.C., Ngo-Giang-Huong N., Belec L., Peeters M., Aghokeng A., Bunupuradah T., Burda S., Cane P., Cappelli G., Charpentier C., Dagnra A.Y., Deshpande A.K., El-Katib Z., Eshleman S.H., Fokam J., Gody J.-C., Katzenstein D., Koyalta D.D., Kumwenda J.J., Lallemant M., Lynen L., Marconi V.C., Margot N.A., Moussa S., Ndung'U T., Nyambi P.N., Orrell C., Schapiro J.M., Schuurman R., Sirivichayakul S., Smith D., Zolfo M., Jordan M.R., Shafer R.W.
• Format: Article
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84878329003&partnerID=40&md5=7faa842164431e19965a00c998235619; http://cmuir.cmu.ac.th/handle/6653943832/919
• Institution: Chiang Mai University

Background The World Health Organization Antiretroviral Treatment Guidelines recommend phasing-out stavudine because of its risk of long-term toxicity. There are two mutational pathways of stavudine resistance with different implications for zidovudine and tenofovir cross-resistance, the primary candidates for replacing stavudine. However, because resistance testing is rarely available in resource-limited settings, it is critical to identify the cross-resistance patterns associated with first-line stavudine failure.MethodsWe analyzed HIV-1 resistance mutations following first-line stavudine failure from 35 publications comprising 1,825 individuals. We also assessed the influence of concomitant nevirapine vs. efavirenz, therapy duration, and HIV-1 subtype on the proportions of mutations associated with zidovudine vs. tenofovir cross-resistance.ResultsMutations with preferential zidovudine activity, K65R or K70E, occurred in 5.3% of individuals. Mutations with preferential tenofovir activity, ≥two thymidine analog mutations (TAMs) or Q151M, occurred in 22% of individuals. Nevirapine increased the risk of TAMs, K65R, and Q151M. Longer therapy increased the risk of TAMs and Q151M but not K65R. Subtype C and CRF01-AE increased the risk of K65R, but only CRF01-AE increased the risk of K65R without Q151M.ConclusionsRegardless of concomitant nevirapine vs. efavirenz, therapy duration, or subtype, tenofovir was more likely than zidovudine to retain antiviral activity following first-line d4T therapy. © The Author 2013. Published by Oxford University Press on behalf of the Infectious Diseases Society of America. All rights reserved.