Can you tell me about mastectomy without chemo or radiation?

Sometimes an option : Women with smaller breast cancers that have not spread outside the breast can often be treated with mastectomy and no radiation or chemotherapy. Sometimes hormone treatments will help such women after surgery. If a tumor is larger (more that 5 cm), more aggressive (poorly differentiated, triple negative, or her2 positive), or in the skin, muscle or lymph nodes chemo and or XRT might be needed.