Treatment with nucleos(t)ide plus non-nucleoside reverse transcriptase inhibitors was associated with the most favourable clinical, immunological and virologic characteristics compared to other analysed antiretroviral combinations: the least common history of AIDS, the highest baseline, nadir and last lymphocyte CD4 counts, as well as the lowest baseline HIV-1 viral load (supplemental figure 2 a,b,c). This evidence concerns the gene CD4 and AIDS.