NR4A1 and breast cancer: All other medication classes of interest, age; diagnosis year; AJCC stage; hormone receptor status; primary treatment for initial breast cancer; endocrine therapy for the incident breast cancer); BMI; smoking; menopausal statu; Charlson co-morbidity score; diabetes; prescription non-steroidal anti-inflammatory medication use, Cox-2 inhibitors, and aspiri; and receipt of screening mammogram in the 12 months prior to events