Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C

Objective: Despite the evidence that antiretroviral treatment (ART) interruption increases the risk of various negative outcomes, it is still likely that HIV/hepatitis C (HCV) co-infected patients will discontinue ART for several reasons. The impact of interruption on liver fibrosis progression in c...

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Main Author: Thorpe, Julia
Other Authors: Erica Moodie (Supervisor2)
Format: Others
Language:en
Published: McGill University 2010
Subjects:
Online Access:http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95226
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spelling ndltd-LACETR-oai-collectionscanada.gc.ca-QMM.952262014-02-13T03:48:17ZAssessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus CThorpe, JuliaHealth Sciences - EpidemiologyObjective: Despite the evidence that antiretroviral treatment (ART) interruption increases the risk of various negative outcomes, it is still likely that HIV/hepatitis C (HCV) co-infected patients will discontinue ART for several reasons. The impact of interruption on liver fibrosis progression in co-infected adults was examined, using the aspartate aminotransferase-to-platelet ratio index (APRI) as a surrogate marker of liver fibrosis. Method: Time-dependent Cox regression, as well as inverse probability-of-treatment weighting (IPTW) in a marginal structural model, were used to evaluate the association of baseline and time-varying covariates with developing significant fibrosis. Results: After accounting for potential confounders, such as HIV viral load and CD4+ T cell count, the hazard ratio for ART interruption was 2.52 (1.20-5.28). Use of IPTW resulted in a similar estimate of effect, suggesting that mediation by time-varying confounders was negligible. Conclusions: ART interruption was independently associated with an increased risk of liver fibrosis progression in HIV/HCV co-infected patients.Objectif: Certains patients coinfectés par le VIH et l'hépatite C interrompent leur traitement antirétroviral (TRT) pour des raisons variées, bien que cela augmente les risques de plusieurs effets indésirables. L'impact de l'interruption du traitement sur la progression de fibrose du foie chez des adultes coinfectés a donc été évalué grâce à l'utilisation du score APRI comme marqueur de fibrose du foie. Méthode: Un modèle Cox ainsi qu'un modèle marginal avec pondération par l'inverse de la probabilité de traitement ont été utilisés. Résultats: Après ajustement, le rapport de risque pour l'interruption du TRT était de 2.52 (1.20-5.28). Un effet similaire a été mesuré lorsque la pondération par l'inverse de la probabilité de traitement a été utilisée, ce qui suggère que l'effet des variables variant avec le temps était négligeable. Conclusions: L'interruption du TRT est indépendamment associée avec un risque accru de la progression de fibrose du foie chez les patients coinfectés avec le VIH et l'hépatite C.McGill UniversityErica Moodie (Supervisor2)Marina B Klein (Supervisor1)2010Electronic Thesis or Dissertationapplication/pdfenElectronically-submitted theses.All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated.Master of Science (Department of Epidemiology & Biostatistics) http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95226
collection NDLTD
language en
format Others
sources NDLTD
topic Health Sciences - Epidemiology
spellingShingle Health Sciences - Epidemiology
Thorpe, Julia
Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C
description Objective: Despite the evidence that antiretroviral treatment (ART) interruption increases the risk of various negative outcomes, it is still likely that HIV/hepatitis C (HCV) co-infected patients will discontinue ART for several reasons. The impact of interruption on liver fibrosis progression in co-infected adults was examined, using the aspartate aminotransferase-to-platelet ratio index (APRI) as a surrogate marker of liver fibrosis. Method: Time-dependent Cox regression, as well as inverse probability-of-treatment weighting (IPTW) in a marginal structural model, were used to evaluate the association of baseline and time-varying covariates with developing significant fibrosis. Results: After accounting for potential confounders, such as HIV viral load and CD4+ T cell count, the hazard ratio for ART interruption was 2.52 (1.20-5.28). Use of IPTW resulted in a similar estimate of effect, suggesting that mediation by time-varying confounders was negligible. Conclusions: ART interruption was independently associated with an increased risk of liver fibrosis progression in HIV/HCV co-infected patients. === Objectif: Certains patients coinfectés par le VIH et l'hépatite C interrompent leur traitement antirétroviral (TRT) pour des raisons variées, bien que cela augmente les risques de plusieurs effets indésirables. L'impact de l'interruption du traitement sur la progression de fibrose du foie chez des adultes coinfectés a donc été évalué grâce à l'utilisation du score APRI comme marqueur de fibrose du foie. Méthode: Un modèle Cox ainsi qu'un modèle marginal avec pondération par l'inverse de la probabilité de traitement ont été utilisés. Résultats: Après ajustement, le rapport de risque pour l'interruption du TRT était de 2.52 (1.20-5.28). Un effet similaire a été mesuré lorsque la pondération par l'inverse de la probabilité de traitement a été utilisée, ce qui suggère que l'effet des variables variant avec le temps était négligeable. Conclusions: L'interruption du TRT est indépendamment associée avec un risque accru de la progression de fibrose du foie chez les patients coinfectés avec le VIH et l'hépatite C.
author2 Erica Moodie (Supervisor2)
author_facet Erica Moodie (Supervisor2)
Thorpe, Julia
author Thorpe, Julia
author_sort Thorpe, Julia
title Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C
title_short Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C
title_full Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C
title_fullStr Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C
title_full_unstemmed Assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with HIV and hepatitus C
title_sort assessing the impact of antiretroviral treatment interruption on progression of liver fibrosis in adults co-infected with hiv and hepatitus c
publisher McGill University
publishDate 2010
url http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95226
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