KRT18 and neoplasm: Using ROC analysis in tumours defined by cytokeratin 18 expression (n = 101, Figure 3), low expression of E‐cadherin was the most sensitive and specific feature of SGST (AUC = 0.97, P < .0001) followed by SSTR2A (AUC = 0.82, P < .0001) and SSTR3 (AUC = 0.72, P = .0001).