Arm B: SEMS plus external beam radiotherapy (Intervention Arm) External beam radiotherapy (EBRT) is routinely available at regional cancer centres across the UK. For palliation of dysphagia in oesophageal cancer, a radiotherapy course delivering a tumour absorbed dose of 20Gy in 5 fractions or 30Gy in 10 fractions within 4 weeks of SEMS insertion.