The main objective of study is to describe the priorities of elderly patients (70 years and over) undergoing a first medical treatment for cancer, at initiation of treatment and after 3 months of treatment. The main criterion is a prioritization of 4 items per patient from a list of 8 expectations regarding the objectives of their treatment: treatment efficacy, life expectancy, autonomy, daily activities, social activities, heaviness of treatment, toxicity, economics.