Clinical Trial, Randomized, Open Label, With an Active Comparator to Assess the Efficacy and Safety of Using Accelerated Partial Irradiation Versus Standard or Hypofractionated Irradiation of the Entire Breast in Patients With Initial Breast Cancer After Conservative Surgery
Radiotherapy has been confirmed as an important treatment breast-conserving surgery reducing the risk of any recurrence of breast cancer and breast cancer-related mortality in patients with early breast cancer. There are no comparative data on the ideal radiotherapy treatment regimen for patients with early stage breast cancer who underwent conservative surgery in the Brazilian population.
• Information to the patient and signed informed consent;
• Women aged ≥50 years
• Breast conserving surgery
• Pathologic tumor size \< 3 cm (maximum microscopic diameter of the invasive component)
• Invasive adenocarcinoma (except classic invasive lobular carcinoma)
• Unifocal disease
• Histopathologic grades I or II
• Eastern Cooperative Oncology Group (ECOG) 0-1
• Lymphovascular invasion absent
• Negative axillary lymph nodes
• Minimum microscopic margins of non-cancerous tissue of 2mm (excluding deep margin when in deep fascia)
• No prior breast or mediastinal radiotherapy
• No hematogenous metastases