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Current HIV Research


ISSN (Print): 1570-162X
ISSN (Online): 1873-4251

Outcomes in Older Versus Younger Patients Over 96 Weeks in HIV-1– Infected Patients Treated with Rilpivirine or Efavirenz in ECHO and THRIVE

Author(s): Robert Ryan, Yaswant K. Dayaram, Deborah Schaible, Bruce Coate and David Anderson

Volume 11, Issue 7, 2013

Page: [570 - 575] Pages: 6

DOI: 10.2174/1570162X12666140128121900

open access plus


Objectives: Increasing life expectancy of HIV-1–infected patients raises interest in how trial results apply to older patients. This post-hoc analysis evaluated potential differences in efficacy and safety in older (≥50 years) versus younger (<50 years) patients in the ECHO and THRIVE trials over 96 weeks.

Methods: HIV-infected, treatment-naïve adults were randomized to receive rilpivirine (RPV) or efavirenz (EFV), plus a background regimen. Virologic response rates (FDA snapshot analysis; HIV-1 RNA <50 copies/mL) were assessed at Week 96. Total-body bone mineral density was evaluated at baseline and Week 96 by dual-energy X-ray absorptiometry scans. Serum concentrations of 25-hydroxy vitamin D (ECHO trial only) were also measured at baseline, Week 24 and Week 48.

Results: 1368 patients were treated. At Week 96, virologic response rates were similar between older (77%) and younger (76%) RPV-treated patients and numerically higher in older (84%) versus younger (76%) EFV-treated patients. No clinically relevant age-related differences were observed in immunologic responses. Small differences were noted in older versus younger patients in adverse events (higher rates of depression, insomnia, and rash in older EFV-treated patients), laboratory abnormalities (increased low-density lipoprotein cholesterol and hyperglycemia in older EFV-treated patients and increased amylase in older patients across treatments), bone mineral density (larger decreases in older patients across treatments), and progression to severe vitamin D deficiency (greater in older versus younger EFV-treated patients).

Conclusion: Efficacy and safety outcomes were generally similar in older versus younger patients in the ECHO and THRIVE trials.

Keywords: Aging, ECHO, efavirenz, rilpivirine, THRIVE, treatment-naive.

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