TERT and endometrial cancer: To test the effect of GSK3β inhibition on endometrial cancer cell growth, the endometrial cancer cell lines AN3CA (type I) and ARK1 (type II), as well as an immortalized normal endometrial epithelial cell line EM-E6/E7/TERT (hereinafter referred to as EM-TERT) [27] were treated with control media or media with 10 mM LiCl.