HPSE and breast carcinoma: In our study, the AP-2γ-ChIP fragments were obtained from human breast cancer cell line MDA-MB-453 with high malignant degree; knock-down of AP-2γ expression in MDA-MB-453 cells by siRNA decreased the expressions of ErbB2, CDH2, IGSF11 and HPSE (Figures 6A and 7), but overexpression of AP-2γ in MDA-MB-231 cells elevated their mRNA and protein levels (Figures 6C and 7).