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Lodwick, R K; Sabin, C A; Porter, K; Ledergerber, B; van Sighem, A; Cozzi-Lepri, A; Khaykin, P; Mocroft, A; Jacobson, L; De Wit, S; Obel, N; Castagna, A; Wasmuth, J C; Gill, J; Klein, M B; Gange, S; Riera, M; Mussini, C; Gutiérrez, F; Touloumi, G; Carrieri, P; Guest, J L; Brockmeyer, N H; Phillips, A N (2010). Death rates in HIV-positive antiretroviral-naive patients with CD4 count greater than 350 cells per microL in Europe and North America: a pooled cohort observational study. Lancet, 376(9738):340-345.

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Abstract

BACKGROUND: Whether people living with HIV who have not received antiretroviral therapy (ART) and have high CD4 cell counts have higher mortality than the general population is unknown. We aimed to examine this by analysis of pooled data from industrialised countries.

METHODS: We merged data on demographics, CD4 cell counts, viral-load measurements, hepatitis C co-infection status, smoking status, date of death, and whether death was AIDS-related or not from 23 European and North American cohorts. We calculated standardised mortality ratios (SMRs) standardised by age, sex, and year, stratifying by risk group. Data were included for patients aged 20-59 years who had at least one CD4 count greater than 350 cells per microL while ART naive. All pre-ART CD4 counts greater than 350 cells per microL from January, 1990, to December, 2004, were included. We investigated mortality for four risk groups--men who have sex with men, heterosexual people, injecting drug users, and those at other or unknown risk. The association between CD4 cell count and death rate was investigated by use of Poisson regression methods.

FINDINGS: Data were analysed for 40,830 patients contributing 80,682 person-years of follow-up. Of 419 deaths, 401 were used in the SMR analysis: 100 men who have sex with men (SMR 1.30, 95% CI 1.06-1.58); 68 heterosexual people (2.94, 2.28-3.73); 203 injecting drug users (9.37, 8.13-10.75); and 30 in the other or unknown risk category (4.57, 3.09-6.53). Compared with CD4 counts of 350-499 cells per microL, death rate was lower in patients with counts of 500-699 cells per microL (adjusted rate ratio 0.77, 95% CI 0.61-0.95) and counts of 700 cells per microL (0.66, 0.52-0.85).

INTERPRETATION: In HIV-infected ART-naive patients with high CD4 cell counts, death rates were raised compared with the general population. In men who have sex with men this was modest, suggesting that a substantial proportion of the increased risk in other groups is due to confounding by other factors. Even though the increased risk is small, new studies of potential benefits of ART in this group are merited.

FUNDING: European Commission, FP6. European AIDS Treatment Network (NEAT). Project number LSHP-CT-2006-037570.
Copyright 2010 Elsevier Ltd. All rights reserved.

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Infectious Diseases
DDC:610 Medicine & health
Language:English
Date:2010
Deposited On:16 Jan 2011 11:20
Last Modified:27 Nov 2013 19:37
Publisher:Elsevier
ISSN:0140-6736
Additional Information:Comment in: Lancet. 2010 Jul 31;376(9738):306-8.
Publisher DOI:10.1016/S0140-6736(10)60932-4
PubMed ID:20638118
Citations:Web of Science®. Times Cited: 40
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