CYP19A1 and breast carcinoma: The search criteria used the following key words: “Adjuvant endocrine therapy for breast cancer” OR “GnRH agonists” OR “Tamoxifen” OR “Aromatase inhibitor” OR “anastrozole” OR “exemestane” OR “letrozole” AND “bone health” OR “fracture” OR “bone mineral density” OR “bisphosphonates” OR “denosumab”.