EGCG induced breast cancer apoptotic cell death at 24 hCaspase 3, 8 and 9 activation.Apoptosis induction by reduced protein expression of adenosine triphosphate binding cassette subfamily G member 2 (ABCG2) and reduction of Bcl-2.Decrease in Wnt-β catenin pathway.Increase in Caspase 3 and 7 activities. Here, ABCG2 is linked to breast cancer.