Dr Sarah Harris is a Consultant Clinical Oncologist based at Guy's and St Thomas' NHS Foundation Trust in London.

Dr Harris trained in clinical oncology as a specialist registrar in Poole and Southampton and as a senior registrar at St Bartholomews Hospital. She spent 2 months in the USA looking at advanced radiotherapy techniques before becoming a consultant clinical oncologist at Guy's and St Thomas'. 

Dr Harris has been a Consultant at Guy's and St Thomas' since 1998. She specialises in the treatment of breast and prostate cancers using drug therapy and radiotherapy. She has a special interest in the use of advanced radiotherapy techniques to deliver the best quality treatment while minimising the side effects to the patient. This allows the external radiotherapy used in breast cancer to avoid the heart and other important structures.

Dr Harris is part of the multi-disciplinary team Guys and St Thomas, which assesses patients’ suitability for intra-operative radiotherapy . This is given as a single treatment to the breast in some patients and may avoid a longer course of external radiotherapy. Dr Harris has trained in treatment of breast and urological cancers using radiotherapy and drug therapies including hormone treatments and chemotherapy and targeted therapies. She is trained in the use of advanced radiotherapy techniques including IMRT and cyberknife with breast cancer and advanced radiotherapy techniques including IMRT , IGRT and cyberknife for urological cancer treatments.

Dr Harris has had many papers published in peer review journals and books, on the management of breast and urological cancers. She is a member of Royal College of Radiologists and Royal College of Physicians