This study is designed to provide comprehensive cross sectional information on the late toxicities following radical chemoradiotherapy in nasopharyngeal carcinoma in patients who are disease free with a minimum of four years follow-up and who were treated with contemporary radiotherapy techniques (IMRT). This is an observational cross-sectional study which will aim to define the late effects in this population, investigating both well known toxicities identified from studies using earlier radiotherapy techniques (2D and 3D radiotherapy) as well as toxicities which have not been well defined in the current literature and which may be under-recognized and under treated (pituitary function and neurocognitive outcomes).