Impact of Sick Peer Relation on Adaptation to Disease and on Treatment of Cancer-suffering Adolescents & Young Adults

"This longitudinal study based upon repeated and multicentric measurement will recruit AYA with cancer in care Units dedicated to them or not. Measures will be quantitative, and repeated every 3 months by questionnaires, as well as qualitative (social network questionnaire, psychological research interview) for teenagers declaring a negative event or a death event during treatments.~Those patients presenting a high depression score will be contacted by a research psychologist for semi-directed interview."