Why is radiation needed after a mastectomy?

Radiation therapy is an important part of the treatment plan after a mastectomy. Radiation is used to reduce the risk of recurrence and has been found to increase overall survival in many studies. By delivering radiation to the area around where the cancer was removed, it ensures that any remaining breast tissue and lymph nodes are treated as well. This can help reduce potential residual tumor cells, which could cause a return or spread of cancer if left untreated. Additionally, radiation also helps improve local control and reduces pain related to surgery. However, not all patients who undergo a mastectomy may need radiation therapy; for some patients based on their individual risk factors and other factors such as age and size of tumor, chemotherapy may be recommended instead. Ultimately your healthcare team will recommend the best course of action for you based upon your individual needs including whether or not radiation therapy is necessary after a mastectomy.