IL13RA2 and familial pancreatic carcinoma: Because the heterogeneity of IL-13Rα2 expression in pancreatic cancer is minimal and the concordance among investigators evaluating the intensity by IHC is high, even a small sample collected by endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) technique may reflect the IL-13Rα2 expression of the entire tumor.