CD4 and breast cancer: The proportion of CRF01_AE infected subjects with CD4+T cell count ≤200 cells/μl was remarkable higher than in CRF07_BC infection (χ2 = 7.621, P = 0.006) and conversely the proportion of CRF01_AE with CD4+T cell count ≥500 cells/μl (χ2 = 4.354, P = 0.037) was lower than in CRF07_BC infected subjects (Fig. 3).