A total of 647 published papers were restricted when we used as keywords “PPARγ” AND “breast cancer.” In order to focus our attention on PPARγ ligands, “natural PPARγ ligands” AND “breast cancer” (37 papers) or “synthetic PPARγ ligands” AND “breast cancer” (46 papers) or “ω 3” AND “PPARγ” AND “breast cancer” (22 papers) keywords were used. This evidence concerns the gene PPARG and breast cancer.