Management issues in neuropathic pain
Neuropathic pain is a common complication to cancer and cancer treatments, such as surgery, chemotherapy, and radiation therapy. Neuropathic pain may be present in up to 40% of cancer patients and may persist independently of the cancer and affect the quality of life in disease-free cancer survivors. Particular surgery and chemotherapy may cause chronic neuropathic pain in cancer survivors. The diagnosis of neuropathic pain can be challenging and requires documentation of a nervous system lesion and pain in areas of sensory changes. The pharmacological treatment includes tricyclic antidepressants, selective serotonin–noradrenaline reuptake inhibitors (duloxetine or venlafaxine), gabapentin, and pregabalin as first-line treatments. Topical lidocaine 5%, capsaicin 8% patches, botulinum toxin type A, tramadol, and strong opioids are second- and third-line treatments. Steroids may have a role in the acute management of cancer-related neuropathic pain. Due to limited efficacy or intolerable side effects at maximal doses, combination therapy is often required and careful monitoring of effect and adverse reactions is important.