Is there any treatment for paraneoplastic syndromes?

When present, the tumor and cancer are treated first, followed by efforts to decrease the autoimmune response-through steroids such as cortisone or prednisone, high-dose intravenous immunoglobulin, or irradiation. Plasmapheresis, a process that cleanses antibodies from the blood, may ease symptoms in people with paraneoplastic disorders that affect the peripheral nervous system. Speech and physical therapy may help individuals regain some functions.

This answer is based on source information from the National Institute of Neurological Disorders and Stroke.