For example, TCDD and other AhR activators are associated with colitis (Benson and Shepherd, 2011) and colorectal cancers (Xie and Raufman, 2015), BPA is implicated in colorectal cancer (Chen et al., 2015), and PAH may lead to digestive tract cancers (Diggs et al., 2011). The gene discussed is AHR; the disease is colorectal cancer.