Impact of low-level viremia on clinical and virological outcomes in treated HIV-1-infected patients

Marie-Anne Vandenhende, Suzanne Ingle, Margaret May, Geneviève Chene, Robert Zangerle, Ard Van Sighem, M John Gill, Carolynne Schwarze-Zander, Beatriz Hernandez-Novoa, Niels Obel, Ole Kirk, Sophie Abgrall, Jodie Guest, Hasina Samji, Antonella D'Arminio Monforte, Josep M Llibre, Colette Smith, Matthias Cavassini, Greer A Burkholder, Bryan ShepherdHeidi M Crane, Jonathan Sterne, Philippe Morlat, Antiretroviral Therapy Cohort Collaboration (ART-CC)

50 Citations (Scopus)

Abstract

BACKGROUND: The goal of antiretroviral therapy (ART) is to reduce HIV-related morbidity and mortality by suppressing HIV replication. The prognostic value of persistent low-level viremia (LLV), particularly for clinical outcomes, is unknown.

OBJECTIVE: Assess the association of different levels of LLV with virological failure, AIDS event, and death among HIV-infected patients receiving combination ART.

METHODS: We analyzed data from 18 cohorts in Europe and North America, contributing to the ART Cohort Collaboration. Eligible patients achieved viral load below 50  copies/ml within 3-9 months after ART initiation. LLV50-199 was defined as two consecutive viral loads between 50 and 199  copies/ml and LLV200-499 as two consecutive viral loads between 50 and 499  copies/ml, with at least one between 200 and 499  copies/ml. We used Cox models to estimate the association of LLV with virological failure (two consecutive viral loads at least 500  copies/ml or one viral load at least 500 copies/ml, followed by a modification of ART) and AIDS event/death.

RESULTS: Among 17 902 patients, 624 (3.5%) experienced LLV50-199 and 482 (2.7%) LLV200-499. Median follow-up was 2.3 and 3.1 years for virological and clinical outcomes, respectively. There were 1903 virological failure, 532 AIDS events and 480 deaths. LLV200-499 was strongly associated with virological failure [adjusted hazard ratio (aHR) 3.97, 95% confidence interval (CI) 3.05-5.17]. LLV50-199 was weakly associated with virological failure (aHR 1.38, 95% CI 0.96-2.00). LLV50-199 and LLV200-499 were not associated with AIDS event/death (aHR 1.13, 95% CI 0.81-1.68; and aHR 0.95, 95% CI 0.62-1.48, [corrected] respectively).

CONCLUSION: LLV200-499 was strongly associated with virological failure, but not with AIDS event/death. Our results support the US guidelines, which define virological failure as a confirmed viral load above 200  copies/ml.

Original languageEnglish
JournalAIDS (London, England)
Volume29
Issue number3
Pages (from-to)373-83
Number of pages11
ISSN0269-9370
DOIs
Publication statusPublished - 28 Jan 2015

Keywords

  • Adult
  • Anti-Retroviral Agents
  • Antiretroviral Therapy, Highly Active
  • Europe
  • Female
  • HIV Infections
  • HIV-1
  • Humans
  • Male
  • Middle Aged
  • North America
  • Prognosis
  • Survival Analysis
  • Treatment Outcome
  • Viral Load
  • Viremia

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