Kai-Uwe Kern,1 Srinivas Nalamachu,2 Louis Brasseur,3 Joanna M Zakrzewska4 1Institute for Pain Medicine, Wiesbaden, Germany; 2International Clinical Research Institute, Overland Park, KS, USA; 3Institut Curie, Saint Cloud, France; 4Eastman Dental Hospital, University College London Hospitals, London, UK Abstract: An expert group of 40 pain specialists from 16 countries performed a first assessment of the value of predictors for treatment success with 5% lidocaine-medicated plaster in the management of cancer pain with neuropathic components and trigeminal neuropathic pain. Results were based on the retrospective analysis of 68 case reports (sent in by participants in the 4 weeks prior to the conference) and the practical experience of the experts. Lidocaine plaster treatment was mostly successful for surgery or chemotherapy-related cancer pain with neuropathic components. A dose reduction of systemic pain treatment was observed in at least 50% of all cancer pain patients using the plaster as adjunct treatment; the presence of allodynia, hyperalgesia or pain quality provided a potential but not definitively clear indication of treatment success. In trigeminal neuropathic pain, continuous pain, severe allodynia, hyperalgesia, or postherpetic neuralgia or trauma as the cause of orofacial neuropathic pain were perceived as potential predictors of treatment success with lidocaine plaster. In conclusion, these findings provide a first assessment of the likelihood of treatment benefits with 5% lidocaine-medicated plaster in the management of cancer pain with neuropathic components and trigeminal neuropathic pain and support conducting large, well-designed multicenter studies. Keywords: lidocaine plaster, neuropathic pain, cancer pain, trigeminal neuropathic pain, case reports