Validation of Prone Crawl Radiotherapy for Whole-breast Irradiation After Breast Conserving Surgery

Inclusion Criteria: * Female patients * Non-metastasized breast carcinoma * Multidisciplinary decision of adjuvant radiotherapy after lumpectomy for breast cancer * Prone WBI without LNI indicated according to the department's guidelines, treatment schedule of at least 15 fractions * Age ≥ 18 years * Informed consent obtained, signed and dated before specific protocol procedures Exclusion Criteria: * \< 18 years old * Mastectomy * Need for LNI * Bilateral breast irradiation * Partial breast irradiation * Unable to be treated in prone position * Less than 15 treatment fractions planned * Situs inversus * 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