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In page Chemotherapy-induced peripheral neuropathy:

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Proteasome inhibitors, namely bortezomib, are used in the treatment of multiple myeloma and certain types of lymphoma. Bortezomib increases the production of sphingosine-1 phosphate, tumor necrosis factor α, and interleukin-1β, which ultimately leads to the development of neuropathic pain. The side effects of receiving bortezomib include chronic, distal, and symmetrical sensory peripheral neuropathy and neuropathic pain syndrome which may last for weeks, months, or years after treatment completion.[citation needed]