MEG3 and ovarian carcinoma: Transfection of ovarian cancer cell lines with Meg3 resulted in inhibition of cell proliferation, colony formation, migration and metastasis, and promotion of G2 phase arrest, as well as cell apoptosis, while after given Meg3-transfected cells with autophagy inhibitor 3MA, the cell viability and colony formation rate was improved as compared with Meg3-transfected cells.