Efficacy of Lidocaine Versus Placebo in Palliative Care Patients With Opioid-refractory Cancer Pain With Neuropathic Component: a Multicenter, Prospective, Double-blind Randomized Placebo-controlled Study.

Inclusion Criteria: * Patient aged 18 years or older * Patient suffering from cancer pain refractory to standard opiates (numeric pain intensity scale NPIS \>=4/10 after 24 hours of continuous intravenous morphine or oxycodone administration \[SOR 2002, analgesics drugs for adults cancer nociceptive pain\]), regardless of the nature of the primary cancer\] * Patient suffering from cancer neuropathic or mixed pain (DNA survey score\> = 4 \[Bouhassira 2004\]) * Patient receiving palliative care as defined by French Society of Palliative and Support Care \[Charte des Soins Palliatifs, 1996, Act No. 99-477 of 9 June 1999 to guarantee the right of access to palliative care\] according to the definition of the World Health Organization (WHO) \[World Health Organization. WHO's pain ladder. http://www.who.int/cancer/palliative/painladder/en/. Accessed December 9.2011\] * Patient with histological diagnosis of cancer, locally advanced or metastatic disease * Patient without curative cancer treatment, and with or without palliative anticancer treatment * Patient hospitalized in a specific palliative care unit * Patient with an estimated survival higher than 48 hours (physician estimation) Patient providing written informed consent for participation prior to any study procedures. Exclusion Criteria: * Patient with a known hypersensitivity to lidocaine * Patient with a history of porphyria, arrhythmias, disorders of atrioventricular conduction requiring permanent pacing not yet realized, uncontrolled epilepsy, uncontrolled hypertension * Patient with hematologic malignancy, abnormal renal, hepatic and cardiac functions * Patient with a altered sleepiness (Epworth scale score ≤ 16) * Patient with altered cognitive function (TELECOM scale score\> 11) \[Arsène 2000\] * Patient not native French speaker Patient defined as vulnerable subject (minor subject, pregnant or nursing woman, subject freedom deprived)