In view of the similarities between the luminal/basal dichotomy of breast cancers and a BC subtyping system proposed by Choi et al. [38], P63 has been commonly regarded as a basal marker, in that it induces a basal phenotype with certain homeostatic signaling pathways; conversely, the peroxisome proliferator activator receptor (PPAR) gamma γ (PPARγ) is a known luminal marker and drives different transcription factors. This evidence concerns the gene PPARG and breast cancer.