A 24-year-old woman notes a lump in her right breast for the past month. She is concerned because her sister was diagnosed with poorly differentiated "triple-negative" breast cancer at age 31. Ultrasonography of the breast shows a solid mass. Fine needle aspiration is attempted but no diagnostic cells are obtained. Mammography is performed and there is a single 1-cm density with small clustered calcifications in the right breast but no lesions of the opposite breast. Which of the following is the best course of action for this patient?