The cost-utility analysis (CUA) is an increasingly used method to help health decision-maker. The CUA uses the Quality Adjusted Life Years (QALY) that combines the length of life with the health related quality of life (HRQoL) into a single score.~In Quebec, no QALY calculation tool has been adapted to its linguistic and socio-cultural context, neither for its general population nor for a particular subpopulation, like patients with cancer.~The objectives will be to analyze the extent of the divergence in terms of health states utilities between the general population and patients with breast or colorectal cancer; to develop a QALY preference weights dataset for patients with cancer; to perform mapping with different health-related quality of life questionnaires by correlating SF6Dv2 with EQ-5D-5L, EORTC QLQ-C30 and FACT- G. The data will be collected with a self-administered online survey. Patients outcomes will be measured at the beginning of the chemotherapy treatment cycle and about 8 days after the start of chemotherapy. Health utilities will be measured with a hybrid method using the time-trade-off (TTO) and the discrete experimental choice (DCE) method using SF6Dv2 questionnaire for health states.
This study will evaluate health utilities in patients with breast or colorectal cancer.