•Significant UK variation exists for thymic epithelial tumour radiotherapy treatment.•Infrequent exposure limits clinician expertise managing thymic epithelial tumours.•The development of wider ...thymic epithelial tumour infrastructure is welcomed.
Significant variation in treatment centre setup and radiotherapy practice for thymic epithelial tumours (TET) was identified through a comprehensive survey of current UK Clinical (Radiation) Oncology practice. Multi-centre collaboration and wider TET specific multidisciplinary team meetings are needed and will be essential for developing expertise in TET radiotherapy.