As summarized in Table 2, PGC mRNA expression was higher in invasive lobular carcinoma than in ductal carcinoma (p < 0.05), positively associated with ER and PR expression in breast cancer (p < 0.05), and negatively associated with the aggressiveness of PAM50 subtypes (p < 0.05). This evidence concerns the gene PGR and breast ductal adenocarcinoma.