Inclusion Criteria:  Histopathologically confirmed squamous cell carcinoma, adenocarcinoma or adenosquamous carcinoma in the oesophagus or cardia (Siewert I or II), cT1 N+ or cT2-4a any N, M0, according to the 8th version of the AJCC TNM classification. Assessed at a multidisciplinary conference to be suitable for curatively intended oncological and surgical treatment. Age > 18 years. Performance status ECOG 0-2. Patient has provided written informed consent.  Exclusion Criteria:  Previous radiotherapy in the thorax (except for tangential field radiotherapy for breast cancer). Inability to understand written and spoken instructions and to comply with protocol requirements.