CYP19A1 and breast cancer: Data were originally collected from clinical trial NCT number NCT01598298, “A Randomized Placebo-Controlled Phase III Study of Duloxetine for Treatment of Aromatase Inhibitor-Associated Musculoskeletal Symptoms in Women With Early Stage Breast Cancer: SWOG S1202.” All analyses and conclusions in this manuscript are the sole responsibility of the authors and do not necessarily reflect the opinions or views of the clinical trial investigators, the NCTN, or the NCI.