Viewpoints on the Social Representations and Rationale Concerning the Choices of Patients, Doctors and Caregivers With Regard to the Management of Patients With Non-resectable Metastatic Cancer of the Colon, Stomach, Bile Ducts, Rectum, Pancreas or Lung, or Gastrointestinal Neuroendocrine Tumours

Inclusion Criteria: I- PATIENTS * men or women * who have been informed about the study * and who have provided verbal consent to take part in the study * able to understand written and spoken French * with non-resectable metastatic cancer of: the colon, or the rectosigmoid junction or the stomach or bile ducts or rectum or gastrointestinal neuroendocrine tumor or lung (not small-cell cancer) or pancreas * with a caregiver designated as the principal caregiver (family, friend, neighbour) * who has consented to the principal caregiver taking part in a qualitative interview * able to take part in an interview lasting roughly one hour II- CAREGIVERS * men or women * who have been informed about the study * who have provided verbal consent to take part in the study * able to understand written and spoken French * able to follow an interview lasting roughly one hour III-DOCTORS * men or women * who have been informed about the study * who have provided verbal consent to take part in the study * specialised in specific organ or oncologist prescriber Exclusion Criteria: I- PATIENTS * under guardianship or ward of court * with a severe handicap (neurological disease: Parkinson, Alzheimer, other dementia, multiple sclerosis, severe mental retardation etc.) II- CAREGIVERS * under guardianship or ward of court, * with a severe handicap (neurological disease: Parkinson, Alzheimer, other dementia, multiple sclerosis…), * with severe mental retardation impairing ability to understand.