Most Left-breast cancer women treated by adjuvant radiotherapy after undergo primary surgery, as there are some microscopic tumor might remain after surgery which could lead to recurrence or metastases (or both) if not treated. Many studies show that the patients treated with radiotherapy for left-sided breast cancer suffer from cardiac complications and mortality in compared to due to the increase of cardiac absorbed dose for the left-sided breast, the cardiac complications increase.Studies have shown that with traditional tangential radiation therapy for breast or chest wall the whole heart dose can vary from 1.4-4.4 Gy and the Left Anterior Descending Coronary Artery (LADCA) dose can vary between 2.4-21.2 Gy for left side treatments.
