Evaluation of irradiated heart volumes in stage I breast cancer patients treated with postoperative adjuvant radiotherapy

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
G GyenesL E Rutqvist

Abstract

To quantify the proportion of heart volumes that received at least 25 Gy with tangential photon fields in patients with left-sided stage I (T1 NOMO) breast cancer treated with breast-conserving surgery. The dose planning of 100 consecutive patients was reviewed. All were irradiated with tangential photon fields that covered the left breast only. A three-dimensional computed tomographic (CT)-based dose planning was made for each patient. The prescribed dose to the tumor was 50 Gy. For each patient, the proportion of the heart included in the 50% isodose was determined from the cumulative dose-volume histogram (DVH). The same volume determination was made for the left-sided breast cancer patients treated with tangential fields during the first Stockholm Breast Cancer Trial. The mean irradiated heart volume that received at least 25 Gy was 5.7% (SD = 4.5%) for the whole group and 11.9% (SD = 3.7%) in those with the highest volumes. The mean irradiated heart volume included in the 50% isodose for patients in the Stockholm Trial was 25% (SD = 11.9%). In this study, the majority of patients with left-sided T1NOMO breast cancer did not receive irradiation to substantial heart volumes. However, in 6% of all studied patients, the propor...Continue Reading

Citations

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