Review Question - QID 214581

A 54-year-old woman presents to the clinic with complaints of a new-onset lump in her left breast. The patient felt it during her breast self-exam last week in the upper left quadrant. She denies any pain with palpation, breast soreness, breast trauma, or breast discharge. Her past medical history is significant for hypertension, which is controlled with lisinopril. Her mother passed away in her 60's from breast cancer, and the patient is extremely concerned. Further workup including a diagnostic mammogram and subsequent biopsy demonstrates infiltrating ductal carcinoma of the breast. What is the most appropriate next step in determining this patient’s prognosis?