The Relation of Virologic and Immunologic Markers to Clinical Outcomes after Nucleoside Therapy in HIV-Infected Adults with 200 to 500 CD4 Cells per Cubic Millimeter
David A. Katzenstein, M.D., Scott M. Hammer, M.D., Michael D. Hughes, Ph.D., Holly Gundacker, M.S., J. Brooks Jackson, M.D., Susan Fiscus, Ph.D., Suraiya Rasheed, M.D., Tarek Elbeik, Ph.D., Richard Reichman, M.D., Anthony Japour, M.D., Thomas C. Merigan, M.D., Martin S. Hirsch, M.D., for The AIDS Clinical Trials Group Study 175 Virology Study Team
Background We studied measures of human immunodeficiency virus(HIV) replication, the viral phenotype, and immune function(CD4 cell counts) and the relation of changes in these indicatorsto clinical outcomes in a subgroup of patients in a controlledtrial of early antiretroviral treatment for HIV, the AIDS ClinicalTrials Group Study 175.
Methods The 391 subjects, each of whom entered the study witha single screening CD4 cell count of 200 to 500 per cubic millimeter,were randomly assigned to receive zidovudine alone, didanosinealone, zidovudine plus didanosine, or zidovudine plus zalcitabine.Plasma concentrations of HIV RNA were assessed in 366 subjects,and viral isolates from 332 subjects were assayed for the presenceof the syncytium-inducing phenotype.
Results After eight weeks, the mean (±SE) decrease frombase line in the concentration of HIV RNA, expressed as thechange in the base 10 log of the number of copies per milliliter,was 0.26±0.06 for patients treated with zidovudine alone,0.65±0.07 for didanosine alone, 0.93±0.10 forzidovudine plus didanosine, and 0.89±0.06 for zidovudineplus zalcitabine (P<0.001 for each of the pairwise comparisonswith zidovudine alone). Multivariate proportional-hazards modelsshowed that higher base-line concentrations of plasma HIV RNA,less suppression of plasma HIV RNA by treatment, and the presenceof the syncytium-inducing phenotype were significantly associatedwith an increased risk of progression to the acquired immunodeficiencysyndrome and death. After adjustment for these measures of viralreplication and for the viral phenotype, CD4 cell counts werenot significant predictors of clinical outcome.
Conclusions Both the risk of the progression of HIV diseaseand the efficacy of antiretroviral therapy are strongly associatedwith the plasma level of HIV RNA and with the viral phenotype.The changes in the plasma concentration of HIV RNA predict thechanges in CD4 cell counts and survival after treatment withreverse-transcriptase inhibitors.
Source Information
From the Stanford University Medical Center, Stanford, Calif. (D.A.K., T.C.M.); Harvard Medical School (S.M.H., A.J., M.S.H.) and Harvard School of Public Health (M.D.H., H.G.), Boston; Case Western Reserve University, Cleveland (J.B.J.); the University of North Carolina, Chapel Hill (S.F.); the University of Southern California, Los Angeles (S.R.); the University of California at San Francisco, San Francisco (T.E.); and the University of Rochester, Rochester, N.Y. (R.R.).
Address reprint requests to Dr. Katzenstein at the Division of Infectious Diseases, S-156, Stanford University Medical Center, Stanford, CA 94305.
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