Immunohistochemically detected E‐cadherin status correlates with the differentiation grade and histological type in breast carcinomas (Acs et al., 2001; Gamallo et al., 1993; Moll et al., 1993) and E‐cadherin expression is also used for the differential diagnosis of papillary thyroid carcinoma (Ceyran et al., 2015). The gene discussed is CDH1; the disease is differentiated thyroid carcinoma.