Elinor Sawyer is Professor of Breast Cancer Molecular Genetics and Head of Cancer Care, Comprehensive Cancer Centre at King’s College London. She is also Honorary Consultant in Clinical Oncology at Guy’s Cancer Centre. She trained as a clinician scientist at the London Research Institute. Her PhD focused on the molecular genetics of phyllodes tumours. Her current research interests are genetic predisposition to breast cancer, particularly lobular breast cancer and DCIS, with a focus on identification of biomarkers that predict progression of LCIS and DCIS. She is a member of the Sloane Steering Committee (a national UK audit of screen detected DCIS) and leads on the molecular analyses of the UK DCIS samples in the CRUK Grand Challenge, PRECISION, and the application of these findings to clinical practice. She is on the Trials Management Group of three National UK radiotherapy studies (IMPORT–LOW, IMPORT–HIGH, Fast Forward) and is also involved in the translational studies associated with these trials.