Elderly CAncer Patient: Qualitative and Quantitative Factors of Inclusion Failure in Clinical Trials

"If a patient is invited to participate in the a clinical trial, inclusion's status (included or/not) will be sought.~* If included: an ethnographic interview will be held with patient (or his representant) who agreed to participate in the clinical trial, his family caregivers, his physician(s) in charge of him and the trial and, and clinical studies technician responsible for management.~* If not included, an ethnographic interview has offered to him, his caregivers, his physician(s) in charge of him and the trial and clinical studies technician responsible for management. In parallel, the reasons for non-inclusion are collected from a pre-established epidemiological questionnaire.~If a patient is not invited to participate,an ethnographic interview will be held with his physician(s) in charge of him and the clinical trial and with clinical studies technician responsible for management.The reasons for non-invitation will be collected from an epidemiological survey multiple choices."