Several other studies reported that TCDD inhibited growth or invasiveness, decreasing pro-invasion genes (CXCR4 and MMP-9) in breast cancer cells [83,84,85,86] and 2,3,7,8-tetrachlorodibenzofuran (TCDF) also inhibited invasion of MDA-MB-431 and T47D cells [86] and BT474 cells [87]. The gene discussed is CXCR4; the disease is breast cancer.