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JAIDS Journal of Acquired Immune Deficiency Syndromes:
doi: 10.1097/01.qai.0000437171.00504.41
Clinical Science

Associations of Inflammatory Markers With AIDS and Non-AIDS Clinical Events After Initiation of Antiretroviral Therapy: AIDS Clinical Trials Group A5224s, a Substudy of ACTG A5202

McComsey, Grace A. MD*; Kitch, Douglas MS; Sax, Paul E. MD; Tierney, Camlin PhD; Jahed, Nasreen C. MS§; Melbourne, Kathleen PharmD; Ha, Belinda MD; Brown, Todd T. MD#; Bloom, Anthony MS**; Fedarko, Neal MD††; Daar, Eric S. MD‡‡

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Background: The association of inflammatory biomarkers with clinical events after antiretroviral therapy initiation is unclear.

Methods: A5202 randomized 1857 treatment-naive subjects to abacavir/lamivudine or tenofovir-DF/emtricitabine with efavirenz or atazanavir/ritonavir. Substudy A5224s measured inflammatory biomarkers on subjects with available plasma from baseline and week 24 or 96. An exploratory analysis of the association of high-sensitivity C-reactive protein, interleukin-6 (IL-6), soluble receptors of tumor necrosis factor α (sTNF)-RI, sTNF-RII, TNF-α, soluble vascular cellular adhesion molecules (sVCAM-1), and soluble intercellular adhesion molecules (sICAM-1) with times to AIDS and to non-AIDS events used Cox proportional hazards models.

Results: Analysis included 244 subjects; 85% men and 48% white non-Hispanic with median age 39 years, HIV-1 RNA of 4.6 log10 copies per milliliter, and CD4 of 240 cells per microliter. Overall, 13 AIDS events (9 opportunistic infections, 3 AIDS-cancers, and 1 recurrent bacterial pneumonia) and 18 non-AIDS events (6 diabetes, 4 cancers, 3 cardiovascular, and 5 pneumonias) occurred. Higher baseline IL-6, sTNF-RI, sTNF-RII, and sICAM-1 were significantly associated with increased risk of AIDS-defining events. Adjustment for baseline HIV-1 RNA did not change results, whereas adjusting for baseline CD4 count left only sTNF-RI and sICAM-1 significantly associated with increased risk. Time-updated values of IL-6, sTNFR-I and II, and sICAM-1 were also associated with an increased risk. For non-AIDS events, only higher baseline high-sensitivity C-reactive protein was significantly associated with increased risk, whereas higher IL-6 was marginally associated with higher risk. Analyses of time-updated biomarker values showed tumor necrosis factor α to be significantly associated with increased risk, even after adjustment for antiretroviral therapy, and CD4 count or HIV-1 RNA.

Conclusions: Higher levels of several inflammatory biomarkers were independently associated with increased risk of AIDS and non-AIDS events.

© 2014 by Lippincott Williams & Wilkins


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