May protect cells from cell death by inducing cytosolic vacuolization and up-regulating the autophagy pathway (PubMed:21072319). May play a role in apoptosis and cell proliferation through its interaction with HSPA5 (PubMed:26045166). Interacts with HSPA5; may regulate the function of HSPA5 in apoptosis and cell proliferation. Expressed in normal endometrium but overexpressed in endometroid tumors. By estrogen replacement therapy. Belongs to the ELAPOR family.