ESR1 and breast cancer: However, this study emphasizes CYP4B1, CYP4F12, and CYP4F3 gene expression levels, focusing on the tumor and normal tissue analysis; their expression, adjusted in stages; their correlation with BRCA1, BRCA2, and ESR1; the estrogen receptor status; and the overall survival analysis in breast cancer patients, while also exploring their expression profiles and alterations across other organs and cancer types.