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Deoxyelephantopin (DOE), a phytochemical, extracted and purified from Elephantopus scaber, has been shown to exhibit antitumor activities. Objective of the present study was to investigate anti-tumor and apoptosis-inducing properties of DOE against uterine leiomyoma (UL) and to explore their molecular mechanisms. Primary cell cultures from fresh UL tissue were established and maintained up to 12 passages. The cells exhibited continuous proliferation with 24 -h doubling time until 12 passages and was then subjected to molecular characterization. The growth inhibitory effect of DOE on UL cells was confirmed by colony formation, cellular senescence, AO/PI and DAPI staining. Fluorescent-activated cell sorting (FACS) assay for apoptosis and cell cycle arrest analysis revealed that DOE significantly (p < 0.05) inhibited the UL cell proliferation via cell cycle arrest at G2/M phase and induced apoptosis via ROS …