Dr Sinead O’Keeffe is a Royal Society – Science Foundation Ireland University Research Fellow at the University of Limerick, Ireland. She leads a team that focuses on the development of optical fibre based sensor systems for the diagnosis, assessment and treatment of cancer tumours. Her current research primarily focuses on radiotherapy for prostate cancer treatment. Sensors are being developed to measure the oxygen concentration of the tumour, which determines how resilient the tumour is to radiation, and also to measure the real-time radiation dose to the tumour and/or nearby critical structures, e.g rectal wall or urethra. Knowledge of this information will allow the radiation oncologists to develop improved personalised treatment plans for patients, ensuring the effective dose is delivered to the target area with minimal side effects to vital organs.She was Chair of the highly successful COST Action TD1001 aimed at developing fibre optic sensor systems for reliable use in safety and security relevant applications in society. She is co-ordinator for the recently funded European H2020 Project “ORIGIN” developing optical fibre based sensors for real-time dose imaging and source localisation for adaptive brachytherapy.