In the Treat Asia HIV Observational Database study in Asia, among patients started on an AZT-containing regimen, older age, lower BMI (<21 kg/m2), baseline anaemia (Hb <10 g/dL) and concurrent TB were associated with anaemia after ART, although this study did not examine AZT as a risk factor in all patients initiating ART [23]. Here, GSTM1 is linked to anemia (phenotype).