The FUT3 gene is also known as the Lewis gene, and the high expression of FUT3 and its product, tetrasaccharide Sialic Lewis x (sLex), has been reported in several types of malignant tumors, such as breast cancer [12], pancreatic cancer [13], ovarian carcinoma, and colorectal cancer [14]. The gene discussed is FUT3; the disease is familial pancreatic carcinoma.