Microscopic residual disease is a risk factor in the primary treatment of breast cancer.

Objectives: In the primary treatment of breast cancer, postoperative radiotherapy is performed in high-risk patients after mastectomy and in patients who received breast conserving surgery. In a retrospective analysis, our mono-institutional results of postoperative irradiation have been evaluated.

Patients And Methods: Between 1992 and 1996, 500 patients have been irradiated after surgery for primary breast cancer.