Dr Doris obtained her Fellowship of the Royal College of Radiologist in Clinical Oncology (FRCR) and was conferred the Rohan Williams Medal. This medal is awarded to an outstanding candidate at each sitting at the final examination from the fellowship. At the Christie, Dr Doris was trained in various cancer subsites and has experience with advanced radiotherapy techniques used for cancer management. 

Her interest is in neuro-oncology and particularly the use of stereotactic radiosurgery to treat benign and malignant central nervous system tumours (brain tumours). Dr Doris also has a keen interest in treating paediatrics brain/spine, lung cancer, thyroid cancer, head and neck cancers, skin cancer, breast cancer and upper and lower gastro intestinal cancers.