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1.  U.S. Trends in Antiretroviral Therapy Use, HIV RNA Plasma Viral Loads, and CD4 T-Lymphocyte Cell Counts Among HIV-Infected Persons, 2000 to 2008 
Annals of internal medicine  2012;157(5):325-335.
The U.S. National HIV/AIDS Strategy targets for 2015 include increasing access to care and improving health outcomes for persons living with HIV in the United States (PLWH-US).
To demonstrate the utility of the NA-ACCORD (North American AIDS Cohort Collaboration on Research and Design) for monitoring trends in the HIV epidemic in the United States and to present trends in HIV treatment and related health outcomes.
Trends from annual cross-sectional analyses comparing patients from pooled, multicenter, prospective, clinical HIV cohort studies with PLWH-US, as reported to national surveillance systems in 40 states.
U.S. HIV outpatient clinics.
HIV-infected adults with 1 or more HIV RNA plasma viral load (HIV VL) or CD4 T-lymphocyte (CD4) cell count measured in any calendar year from 1 January 2000 to 31 December 2008.
Annual rates of antiretroviral therapy use, HIV VL, and CD4 cell count at death.
45 529 HIV-infected persons received care in an NA-ACCORD–participating U.S. clinical cohort from 2000 to 2008. In 2008, the 26 030 NA-ACCORD participants in care and the 655 966 PLWH-US had qualitatively similar demographic characteristics. From 2000 to 2008, the proportion of participants prescribed highly active antiretroviral therapy increased by 9 percentage points to 83% (P < 0.001), whereas the proportion with suppressed HIV VL (≤2.7 log10 copies/mL) increased by 26 percentage points to 72% (P < 0.001). Median CD4 cell count at death more than tripled to 0.209 × 109 cells/L (P < 0.001).
The usual limitations of observational data apply.
The NA-ACCORD is the largest cohort of HIV-infected adults in clinical care in the United States that is demographically similar to PLWH-US in 2008. From 2000 to 2008, increases were observed in the percentage of prescribed HAART, the percentage who achieved a suppressed HIV VL, and the median CD4 cell count at death.
Primary Funding Source
National Institutes of Health, Centers for Disease Control and Prevention, Canadian Institutes of Health Research, Canadian HIV Trials Network, and the government of British Columbia, Canada.
PMCID: PMC3534765  PMID: 22944874
2.  The effect of HIV infection and HAART on inflammatory biomarkers in a population-based cohort of US women 
AIDS (London, England)  2011;25(15):1823-1832.
HIV causes inflammation that can be at least partially corrected by HAART. To determine the qualitative and quantitative nature of cytokine perturbation, we compared cytokine patterns in three HIV clinical groups including HAART responders (HAART), untreated HIV non-controllers (NC), and HIV-uninfected (NEG).
Multiplex assays were used to measure 32 cytokines in a cross-sectional study of participants in the Women's Interagency HIV Study (WIHS). Participants from 3 groups were included: HAART (n=17), NC (n=14), and HIV NEG (n=17).
Several cytokines and chemokines showed significant differences between NC and NEG participants, including elevated IP-10 and TNF-α and decreased IL-12(p40), IL-15, and FGF-2 in NC participants. Biomarker levels among HAART women more closely resembled the NEG, with the exception of TNF-α and FGF-2. Secondary analyses of the combined HAART and NC groups revealed that IP-10 showed a strong, positive correlation with viral load and negative correlation with CD4+ T cell counts. The growth factors VEGF, EGF, and FGF-2 all showed a positive correlation with increased CD4+ T cell counts.
Untreated, progressive HIV infection was associated with decreased serum levels of cytokines important in T cell homeostasis (IL-15) and T cell phenotype determination (IL-12), and increased levels of innate inflammatory mediators such as IP-10 and TNF-α. HAART was associated with cytokine profiles that more closely resembled those of HIV uninfected women. The distinctive pattern of cytokine levels in the 3 study groups may provide insights into HIV pathogenesis, and responses to therapy.
PMCID: PMC3314300  PMID: 21572306
HIV; CD4+ T cells; cytokines; chemokines; HAART
3.  Risk Factors for Tuberculosis After Highly Active Antiretroviral Therapy Initiation in the United States and Canada: Implications for Tuberculosis Screening 
The Journal of Infectious Diseases  2011;204(6):893-901.
Background. Screening for tuberculosis prior to highly active antiretroviral therapy (HAART) initiation is not routinely performed in low-incidence settings. Identifying factors associated with developing tuberculosis after HAART initiation could focus screening efforts.
Methods. Sixteen cohorts in the United States and Canada contributed data on persons infected with human immunodeficiency virus (HIV) who initiated HAART December 1995–August 2009. Parametric survival models identified factors associated with tuberculosis occurrence.
Results. Of 37845 persons in the study, 145 were diagnosed with tuberculosis after HAART initiation. Tuberculosis risk was highest in the first 3 months of HAART (20 cases; 215 cases per 100000 person-years; 95% confidence interval [CI]: 131–333 per 100000 person-years). In a multivariate Weibull proportional hazards model, baseline CD4+ lymphocyte count <200, black race, other nonwhite race, Hispanic ethnicity, and history of injection drug use were independently associated with tuberculosis risk. In addition, in a piece-wise Weibull model, increased baseline HIV-1 RNA was associated with increased tuberculosis risk in the first 3 months; male sex tended to be associated with increased risk.
Conclusions. Screening for active tuberculosis prior to HAART initiation should be targeted to persons with baseline CD4 <200 lymphocytes/mm3 or increased HIV-1 RNA, persons of nonwhite race or Hispanic ethnicity, history of injection drug use, and possibly male sex.
PMCID: PMC3156918  PMID: 21849286
4.  Missing Data on the Estimation of the Prevalence of Accumulated Human Immunodeficiency Virus Drug Resistance in Patients Treated With Antiretroviral Drugs in North America 
American Journal of Epidemiology  2011;174(6):727-735.
Determination of the prevalence of accumulated antiretroviral drug resistance among persons infected with human immunodeficiency virus (HIV) is complicated by the lack of routine measurement in clinical care. By using data from 8 clinic-based cohorts from the North American AIDS Cohort Collaboration on Research and Design, drug-resistance mutations from those with genotype tests were determined and scored using the Genotypic Resistance Interpretation Algorithm developed at Stanford University. For each year from 2000 through 2005, the prevalence was calculated using data from the tested subset, assumptions that incorporated clinical knowledge, and multiple imputation methods to yield a complete data set. A total of 9,289 patients contributed data to the analysis; 3,959 had at least 1 viral load above 1,000 copies/mL, of whom 2,962 (75%) had undergone at least 1 genotype test. Using these methods, the authors estimated that the prevalence of accumulated resistance to 2 or more antiretroviral drug classes had increased from 14% in 2000 to 17% in 2005 (P < 0.001). In contrast, the prevalence of resistance in the tested subset declined from 57% to 36% for 2 or more classes. The authors’ use of clinical knowledge and multiple imputation methods revealed trends in HIV drug resistance among patients in care that were markedly different from those observed using only data from patients who had undergone genotype tests.
PMCID: PMC3202147  PMID: 21813792
antiretroviral therapy, highly active; drug resistance; genotype; HIV
5.  Late Presentation for HIV Care in the United States and Canada 
Initiatives to improve early detection and access to HIV services have increased over time. We assessed the immune status of patients at initial presentation for HIV care from 1997-2007 in 13 US and Canadian clinical cohorts.
We analyzed data from 44,491 HIV-infected patients enrolled in the North American – AIDS Cohort Collaboration on Research and Design. We identified first presentation for HIV care as the time of first CD4+ T-lymphocyte (CD4) measurement and excluded patients who prior to this date had HIV RNA measurements, evidence of antiretroviral exposure, or a history of AIDS-defining illness. Trends in mean CD4 count (measured as cells/mm3) and 95% confidence intervals ([,]) were determined using linear regression adjusted for age, gender, race/ethnicity, HIV transmission risk and cohort.
Median age at first presentation for HIV care increased over time (range 40-43 years, p<0.01), while the proportion of patients with injection drug use HIV transmission risk decreased (26% to 14%, p<0.01) and heterosexual transmission risk increased (16% to 23%, p<0.01). Median CD4 at presentation increased from 256 (IQR: 96-455) to 317 (IQR: 135-517) in 1997 to 2007 (p<0.01). The proportion with a CD4 count ≥350 at first presentation also increased from 1997 to 2007 (38% to 46%, p=<0.01). The estimated adjusted mean CD4 count increased at a rate of 6 [5, 7] per year.
CD4 count at first presentation for HIV care has increased annually over the past 11 years, but has remained <350 cells/mm3, suggesting the urgent need for earlier HIV diagnosis and treatment.
PMCID: PMC2862849  PMID: 20415573
CD4 Lymphocyte Count; Delivery of Health Care / statistics & numerical data; HIV Infections / therapy; United States; Canada

Results 1-5 (5)