BIRC5 and gastric carcinoma: For example, REG4 expression seems to be responsible for cell resistance to anticancer drugs such as 5-fluouracil and methotrexate [15], [20], it promotes AKT phosphorylation and over-expression of the antiapoptotic proteins Bcl-2, Bcl-xL and survivin [21], [22], it activates the EGF receptor/Akt/AP1 signaling pathway [21] and its expression correlates with enhanced peritoneal metastasis in gastric carcinomas [22], [23].