Virologic and immunologic response to HAART, by age and regimen class.

Academic Article


  • OBJECTIVE: To determine the impact of age and initial HAART regimen class on virologic and immunologic response within 24 months after initiation. DESIGN: Pooled analysis of data from 19 prospective cohort studies in the North American AIDS Cohort Collaboration on Research and Design (NA-ACCORD). METHODS: Twelve thousand, one hundred and ninety-six antiretroviral-naive adults who initiated HAART between 1998 and 2008 using a boosted protease inhibitor-based regimen or a nonnucleoside reverse transcriptase inhibitor (NNRTI)-based regimen were included in our study. Discrete time-to-event models estimated adjusted hazard odds ratios (aHOR) and 95% confidence intervals (CIs) for suppressed viral load (≤500 copies/ml) and, separately, at least 100 cells/μl increase in CD4 cell count. Truncated, stabilized inverse probability weights accounted for selection biases from discontinuation of initial regimen class. RESULTS: Among 12 196 eligible participants (mean age = 42 years), 50% changed regimen classes after initiation (57 and 48% of whom initiated protease inhibitor and NNRTI-based regimens, respectively). Mean CD4 cell count at initiation was similar by age. Virologic response to treatment was less likely in those initiating using a boosted protease inhibitor [aHOR = 0.77 (0.73, 0.82)], regardless of age. Immunologic response decreased with increasing age [18-<30: ref; 30-<40: aHOR = 0.92 (0.85, 1.00); 40-<50: aHOR = 0.85 (0.78, 0.92); 50-<60: aHOR = 0.82 (0.74, 0.90); ≥60: aHOR = 0.74 (0.65, 0.85)], regardless of initial regimen. CONCLUSION: We found no evidence of an interaction between age and initial antiretroviral regimen on virologic or immunologic response to HAART; however, decreased immunologic response with increasing age may have implications for age-specific when-to-start guidelines.
  • Published In

  • AIDS  Journal
  • Keywords

  • Adolescent, Adult, Age Distribution, Antiretroviral Therapy, Highly Active, CD4 Lymphocyte Count, Female, HIV Infections, HIV-1, Humans, Logistic Models, Male, Middle Aged, RNA, Viral, Viral Load, Young Adult
  • Digital Object Identifier (doi)

    Author List

  • Althoff KN; Justice AC; Gange SJ; Deeks SG; Saag MS; Silverberg MJ; Gill MJ; Lau B; Napravnik S; Tedaldi E
  • Start Page

  • 2469
  • End Page

  • 2479
  • Volume

  • 24
  • Issue

  • 16