Cystic fibrosis transmembrane regulator (CFTR), downregulated in adenoma (DRA, SLC26A3), putative anion transporter 1 (Pat‐1, SLC26A6) and anion exchanger 4 (AE4, SLC4A9), which transport Cl−/HCO3− to control pHi. This evidence concerns the gene SLC4A9 and adenoma.