Alice Zhabokritsky1,2, Leah Szadkowski1,3, Curtis Cooper4,5, Mona Loutfy2,6, Alexander Wong7, Alison McClean8, Robert S Hogg8, Sharon L Walmsley1,2,9. 1. Department of Medicine, University Health Network, Toronto, Canada. 2. Department of Medicine, University of Toronto, Toronto, Canada. 3. Biostatistics Research Unit, University Health Network, Toronto, Canada. 4. Department of Medicine, University of Ottawa, Ottawa, Canada. 5. Clinical Epidemiology Program, The Ottawa Hospital Research Institute, Ottawa, Canada. 6. Women's College Research Institute, Women's College Hospital, Toronto, Canada. 7. Department of Medicine, University of Saskatchewan, Regina, Canada. 8. British Columbia Centre for Excellence in HIV/AIDS, Vancouver, BC, Canada. 9. Toronto General Hospital Research Institute, University Health Network, Toronto, Canada.
Abstract
OBJECTIVES: To determine the time to CD4 : CD8 ratio normalization among Canadian adults living with HIV in the modern ART era. To identify characteristics associated with ratio normalization. PATIENTS AND METHODS: Retrospective analysis of the Canadian Observational Cohort (CANOC), an interprovincial cohort of ART-naive adults living with HIV, recruited from 11 treatment centres across Canada. We studied participants initiating ART between 1 January 2011 and 31 December 2016 with baseline CD4 : CD8 ratio <1.0 and ≥2 follow-up measurements. Normalization was defined as two consecutive CD4 : CD8 ratios ≥1.0. Kaplan-Meier estimates and log-rank tests described time to normalization. Univariable and multivariable proportional hazards (PH) models identified factors associated with ratio normalization. RESULTS: Among 3218 participants, 909 (28%) normalized during a median 2.6 years of follow-up. Participants with higher baseline CD4+ T-cell count were more likely to achieve normalization; the probability of normalization by 5 years was 0.68 (95% CI 0.62-0.74) for those with baseline CD4+ T-cell count >500 cells/mm3 compared with 0.16 (95% CI 0.11-0.21) for those with ≤200 cells/mm3 (P < 0.0001). In a multivariable PH model, baseline CD4+ T-cell count was associated with a higher likelihood of achieving ratio normalization (adjusted HR = 1.5, 95% CI 1.5-1.6 per 100 cells/mm3, P < 0.0001). After adjusting for baseline characteristics, time-dependent ART class was not associated with ratio normalization. CONCLUSIONS: Early ART initiation, at higher baseline CD4+ T-cell counts, has the greatest impact on CD4 : CD8 ratio normalization. Our study supports current treatment guidelines recommending immediate ART start, with no difference in ratio normalization observed based on ART class used.
OBJECTIVES: To determine the time to CD4 : CD8 ratio normalization among Canadian adults living with HIV in the modern ART era. To identify characteristics associated with ratio normalization. PATIENTS AND METHODS: Retrospective analysis of the Canadian Observational Cohort (CANOC), an interprovincial cohort of ART-naive adults living with HIV, recruited from 11 treatment centres across Canada. We studied participants initiating ART between 1 January 2011 and 31 December 2016 with baseline CD4 : CD8 ratio <1.0 and ≥2 follow-up measurements. Normalization was defined as two consecutive CD4 : CD8 ratios ≥1.0. Kaplan-Meier estimates and log-rank tests described time to normalization. Univariable and multivariable proportional hazards (PH) models identified factors associated with ratio normalization. RESULTS: Among 3218 participants, 909 (28%) normalized during a median 2.6 years of follow-up. Participants with higher baseline CD4+ T-cell count were more likely to achieve normalization; the probability of normalization by 5 years was 0.68 (95% CI 0.62-0.74) for those with baseline CD4+ T-cell count >500 cells/mm3 compared with 0.16 (95% CI 0.11-0.21) for those with ≤200 cells/mm3 (P < 0.0001). In a multivariable PH model, baseline CD4+ T-cell count was associated with a higher likelihood of achieving ratio normalization (adjusted HR = 1.5, 95% CI 1.5-1.6 per 100 cells/mm3, P < 0.0001). After adjusting for baseline characteristics, time-dependent ART class was not associated with ratio normalization. CONCLUSIONS: Early ART initiation, at higher baseline CD4+ T-cell counts, has the greatest impact on CD4 : CD8 ratio normalization. Our study supports current treatment guidelines recommending immediate ART start, with no difference in ratio normalization observed based on ART class used.
Authors: S Serrano-Villar; S Moreno; M Fuentes-Ferrer; C Sánchez-Marcos; M Avila; T Sainz; N G P de Villar; A Fernández-Cruz; V Estrada Journal: HIV Med Date: 2013-09-06 Impact factor: 3.180
Authors: F De Salvador-Guillouët; C Sakarovitch; J Durant; K Risso; E Demonchy; P M Roger; E Fontas Journal: PLoS One Date: 2015-10-20 Impact factor: 3.240
Authors: Sergio Serrano-Villar; Talia Sainz; Sulggi A Lee; Peter W Hunt; Elizabeth Sinclair; Barbara L Shacklett; April L Ferre; Timothy L Hayes; Ma Somsouk; Priscilla Y Hsue; Mark L Van Natta; Curtis L Meinert; Michael M Lederman; Hiroyu Hatano; Vivek Jain; Yong Huang; Frederick M Hecht; Jeffrey N Martin; Joseph M McCune; Santiago Moreno; Steven G Deeks Journal: PLoS Pathog Date: 2014-05-15 Impact factor: 6.823