Quality of Life in Patients Treated for Head and Neck Cancer

Rationale: Due to advanced technologies in the last decade, increasingly more treatment options are available for head and neck cancer (HNC). As a consequence decision-making with regard to choosing the best available treatment option is becoming increasingly relevant. Quality of life weights (utility scores) are an important outcome measure in this decision-making process. Utility scores can be combined with life expectancy, resulting in the Quality Adjusted Life Year (QALY). If in economic evaluation the outcomes are expressed in QALYs gained, it is possible to compare the efficiency of different interventions for different indications. However, limited evidence on utility scores after treatment for HNC is available. Objective: The investigators' main objective is to examine quality of life (QoL), both utility scores and disease specific quality of life, for different treatment modalities in HNC. Secondary objectives are to examine whether QoL differs across health states, and which factors influence QoL. As extensive data are available on disease-specific quality of life, another objective is to examine whether utility scores can be derived from a commonly used disease-specific questionnaire, the EORTC QLQ-C30/QLQ-H\&N35. If this would be possible, this would limit patient burden in future clinical trials. Finally, by means of measuring patients' ability to perform their work, diet and dental consequences the investigators aim to measure the impact of HNC and its treatment. Study design: The investigators' study design is a cross-sectional survey. Study population: The study population consists of patients with HNC who are treated at least six months ago for curative radiotherapy and/or surgery with or without chemotherapy. Intervention/method: Patients are asked to fill out a single set of questionnaires (once-only). The set of questionnaires consists of three validated questionnaires, concerning health state utility (EuroQol-5D), disease-specific quality of