Rosado-Sánchez, IHerrero-Fernández, IGenebat, MRuiz-Mateos, ELeal, MPacheco, Yolanda M2023-01-252023-01-252016-10-20http://hdl.handle.net/10668/10690 The persistence of an inverted CD4/CD8 ratio has been extensively associated with the increased morbimortality of chronic human immunodeficiency virus (HIV)-infected subjects. Thymic function is crucial for the maintenance of T cell homeostasis. We explored the impact of thymic function on the CD4/CD8 ratio of HIV-infected subjects.  In a cohort of 53 antiretroviral-naive HIV-infected subjects, the measure of thymic volume, as a representative marker for thymic function, was available at baseline and at 12, 24, and 48 weeks post antiretroviral treatment.  Baseline thymic volume was associated with the CD4/CD8 ratio ( Ρ: = 0.413, P = .002), being this association highly dependent on the CD4 T cell levels. In subjects who achieved undetectable viral load after treatment (n = 33), a higher baseline thymic volume was associated with a higher increase in CD4 T cell counts and a decreasing trend in CD8 T cell counts during follow-up. Moreover, the baseline thymic volume was independently associated with the normalization of the CD4/CD8 ratio after 96 weeks of treatment (odds ratio, 95% confidence interval: 1.95 (1.07-3.55); P = .03).  Our data indicate the relevance of the remaining thymic function before the start of treatment to the CD4/CD8 ratio of HIV- infected subjects and, hence, potentially, in their clinical progression.enCD4/CD8 ratioHIVantiretroviral naive.delta-TRECsthymic functionAdultAntiretroviral Therapy, Highly ActiveBiomarkersCD4 Lymphocyte CountCD4-CD8 RatioFemaleHIV InfectionsHIV-1HumansImmunophenotypingMaleOrgan SizePhenotypeT-Lymphocyte SubsetsThymus GlandTomography, X-Ray ComputedTreatment OutcomeViral Loadresearch article27986677open access10.1093/cid/ciw7111537-6591https://academic.oup.com/cid/article-pdf/64/2/152/13803513/ciw711.pdf