3.8. Effects of γ-Tocotrienol, Rosiglitazone, and GW9662 Treatment Alone or in Combination on PPARγ Expression and PPRE Mediated Reporter Activity in PPARγ siRNA Transfected PPARγ Positive MCF-7 and MDA-MB-231 Human Breast Cancer Cells. This evidence concerns the gene PPARG and breast cancer.