Determinants of Restoration of CD4 and CD8 Cell Counts and their Ratio in HIV-1 Positive Individuals with Sustained Virological Suppression on Antiretroviral Therapy.

JAIDS-JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES(2019)

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摘要
Background: An increasing number of HIV-positive individuals now start antiretroviral therapy (ART) with high CD4 cell counts. We investigated whether this makes restoration of CD4 and CD8 cell counts and the CD4: CD8 ratio during virologically suppressive ART to median levels seen in HIV-uninfected individuals more likely and whether restoration depends on gender, age, and other individual characteristics. Methods: We determined median and quartile reference values for CD4 and CD8 cell counts and their ratio using cross-sectional data from 2309 HIV-negative individuals. We used longitudinal measurements of 60,997 HIV-positive individuals from the Antiretroviral Therapy Cohort Collaboration in linear mixed-effects models. Results: When baseline CD4 cell counts were higher, higher long-term CD4 cell counts and CD4: CD8 ratios were reached. Highest long-term CD4 cell counts were observed in middle-aged individuals. During the first 2 years, median CD8 cell counts converged toward median reference values. However, changes were small thereafter and long-term CD8 cell count levels were higher than median reference values. Median 8-year CD8 cell counts were higher when ART was started with,250 CD4 cells/mm(3). Median CD4: CD8 trajectories did not reach median reference values, even when ART was started at 500 cells/mm(3). Discussion: Starting ART with a CD4 cell count of >= 500 cells/mm3 makes reaching median reference CD4 cell counts more likely. However, median CD4: CD8 ratio trajectories remained below the median levels of HIV-negative individuals because of persisting high CD8 cell counts. To what extent these subnormal immunological responses affect specific clinical endpoints requires further investigation.
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关键词
CD4 cell count,CD8 cell count,CD4:CD8 ratio,antiretroviral therapy,HIV,age
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