The stage of the cancer in a particular patient is rated between I and IV depending on the size of the primary tumor (T), involvement of lymph nodes (N) and distant spread (metastasis) (M). This is called the TNM classification system.
The stage gives an indication of prognosis and guides treatment.
Treatment of early breast cancer involves local therapy. Local therapy includes surgery and radiotherapy. Systemic therapies, chemotherapy, and hormonal therapy may be added (adjuvant therapy) to prevent recurrence or to treat more advanced.
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