Comparison of Set-up Reproducibility Between Prone and Supine Intensity Modulated Radiotherapy (IMRT) for the Adjuvant Treatment of Breast Carcinoma After Lumpectomy

Inclusion Criteria: * female patients * multidisciplinary decision of adjuvant radiotherapy after lumpectomy for breast cancer * minimum 18 years * informed consent obtained, signed and dated before specific protocol procedures. Exclusion Criteria: * mastectomy * need for axillary irradiation * bilateral breast irradiation * previous irradiation at the same time * pregnant or breastfeeding * mental condition rendering the patient unable to understand the nature, scope and possible consequences of the study. * patient unlikely to comply with the protocol; i.e. uncooperative attitude, inability to return for follow-up visits, and unlikely to complete the study.