Impact of V106I on Resistance to Doravirine

Summary

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Description

Testing for transmitted drug resistance (TDR) in the reverse transcriptase and protease in newly diagnosed patients with HIV is recommended by treatment guidelines. Currently clinical practice for first line treatment is moving to a test and treat approach. In this setting, Spanish GESIDA guidelines...

Testing for transmitted drug resistance (TDR) in the reverse transcriptase and protease in newly diagnosed patients with HIV is recommended by treatment guidelines. Currently clinical practice for first line treatment is moving to a test and treat approach. In this setting, Spanish GESIDA guidelines indicate that a first line protease (PI) or integrase (INI) inhibitor-based regimen may be started even if results from baseline resistance are yet not available. This indication is based on the very low prevalence of INI or PI TDR. In Europe, TDR to NNRTIs has stabilized between 4-5%. Doravirine has a unique mutational pattern and its activity is affected by mutations that are usually not found at baseline as TDR (V106A/M, V108I, Y188L, G190S, F227 C/L/V, M230I/L, L234I, P236L Y318F and K103N/Y181C), as a recent European survey has already shown. In addition, these findings have been confirmed in a survey the study investigators have conducted in Spain. However, in this study the Stanford algorithm was used to evaluate clinical resistance to NNRTIs and, surprisingly found an unexpected high prevalence of resistance to Doravirine (as high as for first generation NNRTIs). Study investigators detected that resistance to Doravirine was mainly driven by V106I mutation, which Stanford scores as "low-level resistance". MeditRes is a consortium of HIV clinical virologists from France (leader Anne-Genevieve Marcellin, Paris), Italy (leader Francesca Ceccerini-Silbesrtein, Rome, Spain (leader Federico García, Granada), Greece (leader Dimitrios Paraskevis, Athens) and Portugal (leader Perpetua Gomes, Lisbon). Each of these team leaders has access/coordinate local or national cohorts in their countries. This study aims to investigate the prevalence of V106I TDR in patients joining the MEDITRES consortium during years 2018 and 2019. In patients carrying V106I in the background of a wild-type virus phenotypic resistance to Doravirine will be evaluated the Fold-Change (FC) will be calculated. In addition, Site Directed Mutagenesis (SDM) will be used to evaluate FC to Doravirine in the background of B and CRF02-AG subtypes. Patient recruitment will follow general recruitment procedures to be incorporated into each running cohorts currently contributing to MEDITRES (multicentre, prospective cohort of HIV-positive, antiretroviral-naïve subjects over 18 years of age, including both seroprevalent and seroconverter patients).

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