Objectives
HIV-2-infected individuals usually initiate antiretroviral therapy (ART) at an advanced age compared with HIV-1 patients, with a potential impact on treatment outcomes. This study aimed to investigate the effect of sex and age on mortality and loss to follow-up (LTFU) among HIV-2-infected individuals initiating ART.
Methods
Analyses were conducted using the database of the IeDEA–HIV-2 West Africa collaboration. LTFU was considered if the interval between the last visit and the closing date for this analysis was >180 days. Probability of death and LTFU were estimated with Kaplan-Meier methods. A Cox regression model was used to identify factors associated with death and LTFU over the first 24 months on ART.
Results
A total of 1,825 HIV-2-infected individuals including 60% women were considered for this analysis. The median age, baseline CD4 and follow-up duration were 45 years (IQR[38-52]), 185 cells/mm3 (IQR[95–297]) and 28.8 months (IQR[9.8–58.9]), respectively. Over the first 24 months, the mortality rate was 5.2 per100 pyo (95%CI[4.4-6.1]) and 469 (25.7%) were LTFU. Male sex (HR=1.9; 95%CI[1.4;2.8]), baseline CD4<100 cell/mm3 (HR=4.4 95%CI[1.7;11.1]; ref≥350 cell/mm3), haemoglobin 7.5–10g/dL (HR=2.4 95%CI[1.3;4.4]; ref≥12 g/dL); and body mass index <18 kg/m2 (HR=2.1 95%CI[1.3;3.4]; ref=18-25 kg/m2) were associated with higher mortality over the first 24 months. Similar associations were found for LTFU.
Conclusion
Mortality and LTFU are high among ART-receiving HIV-2-infected individuals and higher in men than in women. There is a critical need to further determine the causes of poor retention and implement sex specific solutions that improve outcomes in HIV-2 ART programs.