Prospective Multicentre Study of the Use of Ketamine in the Treatment of Refractory Chronic Pain in the French CLCC

"Collection of information concerning Ketamine use by French CLCCs pain teams (first prescription):~1. Indications : analgesic treatment of cancer chronic pain, analgesic treatment for a post-cancer treatment chronic pain, help for withdrawal from opioid treatment prescribed for a chronic cancer pain~2. Administration protocol: route, posology, duration, administration sequence, premedication~3. Antalgic efficacy~4. Tolerance profile~5. Quality of life, anxiety and depression evaluations"