Validation of a Screening Scale for Misuse of Opioid Analgesics

Inclusion Criteria: * Patients aged 18 and over, * Patients with chronic cancer-related pain that has been evolving for at least 3 months, * Patients with a regular prescription of at least one opioid analgesic medicine taken daily for at least 1 month, * Patients followed in oncology for an active cancerous pathology. Exclusion Criteria: * Stopping opioid prescriptions on the day of the test phase (no Retest possible), * Patients in the process of weaning (risk of being weaned during the Retest phase), * Patients unable to complete the questionnaire on their own, * Patients followed in a pain or addiction centre, * Patients in terminal palliative situations of their cancer, * Patients with chronic pain that is more disabling than cancer-related pain, * Patients refusing to participate, * Patients under guardianship or curatorship, * Pregnant or breastfeeding patients, * Patient with a language barrier limiting understanding of the questionnaire in French.