第114回 E問題 35

A 42-year-old woman came to your clinic, anxious about a mass in her left breast. On physical examination, the mass was hard and fixed neither to skin nor to muscle. No axillary lymph nodes were palpated on either side. Mammography showed a 2.5-cm lesion with spiculae. Histo-pathological findings from the biopsy showed an invasive ductal carcinoma. No metastases were detected on chest/abdominal CT or on bone scintigraphy.

What is the most appropriate plan at present?