ESTRO Multidisciplinary Management of Breast Cancer 2017

Comparison of Randomised and Observational Data

• Data sources:

– Randomised: EBCTCG – Observational: SEER Cancer Registries

• Treatment comparison: – Radiotherapy versus not in women after BCS, or after mastectomy in pN+ disease

McGale et al, JCO 2016; 34:3356