NT5E（5'-nucleotidase ecto），癌症关联基因，基因ID：4907，该基因编码的蛋白是一种质膜蛋白，催化胞外核苷酸转化为膜渗透性核苷。编码蛋白被用作淋巴细胞分化的决定因素。这种基因的缺陷会导致关节和动脉钙化。两个编码不同亚型的转录变体已经被发现。The protein encoded by this gene is a plasma membrane protein that catalyzes the conversion of extracellular nucleotides to membrane-permeable nucleosides. The encoded protein is used as a determinant of lymphocyte differentiation. Defects in this gene can lead to the calcification of joints and arteries. Two transcript variants encoding different isoforms have been found for this gene.关联癌症：结直肠癌。关联化疗药物：西妥昔单抗。