ABCG2 and malignant colon neoplasm: For example, hsa-miR-519c has been shown to target the 3′UTR of ABCG2 to modulate its protein outcomes in parental human colon cancer S1 cells whereas not in the drug-resistant S1MI80 cells, as the latter are comprised of shortened ABCG2 mRNA escaping miR-519c-controlled PTGR and leading to ABCG2 overexpression in the drug-resistant cells (To et al., 2008; To et al., 2009).