Commentary: optimal adjuvant endocrine therapy of postmenopausal breast cancer.

There is a growing body of evidence that the optimal adjuvant endocrine therapy for hormone-sensitive breast cancer in postmenopausal women should include an aromatase inhibitor. However, further research is required to establish the optimal aromatase inhibitor and whether such a drug should be used as monotherapy or in sequence after 2 to 3 years of tamoxifen.