Radiation therapy (XRT) is an important modality in the treatment of cancer, and XRT is now commonly utilized in the treatment of early-stage breast cancer. However, its use has occasionally resulted in the development of secondary malignancies. We present a critical review of radiation- induced sarcoma (RIS) that develops after irradiation for the treatment of breast cancer.
Methods
The case of a patient who developed sarcoma after radiation for breast cancer is presented, and current literature on RIS is reviewed. The role of XRT in the development of RIS is examined, and the evaluation and treatment of these malignancies are reviewed.
Results
RIS occurs in 0.2% of patients following treatment of breast cancer. The role of radiation in the development of RIS has been clearly demonstrated. Clinical presentation varies, and diagnosis is commonly delayed. Treatment consists of wide surgical excision. The role of chemotherapy is controversial.
Conclusions
The occurrence of RIS following treatment of breast cancer is rare. Its development has an average latency of over 10 years and likely correlates with the dose and technique of the radiation treatment. The prognosis of patients with RIS following treatment for breast cancer is poor predominantly due to a delay in diagnosis. However, the benefit derived by breast cancer patients from XRT far outweighs the risk of RIS and should not affect the decision to treat these patients with this modality.
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