Association between EBV infection and breast carcinoma risk (ORs).
Ten studies that adopted non-breast-cancer control groups – were selected for the analysis of EBV infection and human breast carcinoma risk. One  was excluded automatically after data pooling for the absence of EBV DNA in both patient and control groups. Random-effects model was chosen to estimate the ORs after pooling due to the high heterogeneity among these studies (I2 = 75.9%, P = 0.000). A significant, 6.29-fold (95% CI = 2.13–18.59) increased breast carcinoma risk in patients with an EBV infection was shown.