SLC4A4 and thyroid gland papillary carcinoma: Two studies of papillary thyroid cancers (PTC) in patients of Polish (Galeza-Kulik et al., 2006) and Korean (Kim et al., 2010) descent showed that mRNA expression of SLC4A4 (NBCe1) was decreased by 7- and 3-fold, respectively, in PTC compared to normal tissue.