CD4 and breast cancer: When compared with the demographic information between CRF07_BC and CRF01_AE infections, we found that CRF07_BC infections had a higher proportion of MSM (32.9% versus 23.8%), lower age (36.2 ± 13.3 years versus 42.8 ± 13.8 years), and higher of CD4+ T cell count (306.0, IQR: 201.0~402.0 cells/μl versus 254.0, IQR: 77.5~378.5 cells/μl) (Table 2).