Paraneoplastic Neurologic Disorders

Why do the symptoms of a paraneoplastic neurologic disorder appear before cancer is diagnosed?

The symptoms of a paraneoplastic neurologic disorder are caused by the presence of a cancerous tumor. At first, the tumor is too small to be detected. The body starts to respond by producing cancer-fighting antibodies or white blood cells known as T cells. Researchers believe paraneoplastic neurologic disorder occur when the body mistakenly attacks normal cells in the nervous system. Two-thirds of patients develop neurologic symptoms before any cancer is detected.

Last updated on 05-01-20

What are paraneoplastic neurologic disorders?

Paraneoplastic neurologic disorders are a group of rare degenerative conditions that are triggered by a person's immune system response to a cancerous tumor. Researchers believe these disorders occur when cancer- fighting antibodies or white blood cells known as T cells mistakenly attack normal cells in the nervous system. Paraneoplastic neurologic disorders typically develop after mid- adulthood and are most common in people with lung, ovarian, lymphatic, or breast cancer. Symptoms generally develop over a period of days to weeks and usually occur prior to tumor detection. These symptoms may include difficulty in walking and/or swallowing, loss of muscle tone, loss of fine motor coordination, slurred speech, memory loss, vision problems, sleep disturbances, dementia, seizures, sensory loss in the limbs, and vertigo. Paraneoplastic neurologic disorders include Lambert-Eaton myasthenic syndrome, stiff-person syndrome, encephalomyelitis (inflammation of the brain and spinal cord), myasthenia gravis, cerebellar degeneration, limbic and/or brainstem encephalitis, neuromyotonia, and opsoclonus (involving eye movement) and sensory neuropathy. Treatment involves treatment of the underlying tumor, immunotherapy, and supportive therapy.

Last updated on 05-01-20

What is the prognosis for people with a paraneoplastic neurologic disorder?

The prognosis for people with a paraneoplastic neurologic disorder depends on the type of paraneoplastic disorder and the type of cancer with which they are diagnosed. There are no cures for paraneoplastic disorders and resulting progressive neurological damage. Prompt treatment of the underlying tumor and immunotherapy may be beneficial in stabilizing a person's neurologic symptoms. Less often, treatment of the tumor improves the neurologic symptoms.

Last updated on 05-01-20

Selected Full-Text Journal Articles

Autoimmune Encephalitis - articles

Binks SNM, Klein CJ, Waters P, Pittock SJ, Irani SR. LGI1, CASPR2 and related antibodies: a molecular evolution of the phenotypes. J Neurol Neurosurg Psychiatry. 2018 May;89(5):526-534.

Last updated on 04-27-20

Paraneoplastic disorder Free Full-text

Jammoul A, Li Y, Rae-Grant A. Autoantibody-­mediated encephalitis: Not just paraneoplastic, not just limbic, and not untreatable. Cleveland Clinic Journal of Medicine. 2016 January;83(1):43-53.

Last updated on 04-27-20

Social Networking Websites

IAES Facebook

The International Autoimmune Encephalitis Society Facebook group offers educational support through this forum.

Last updated on 04-27-20

Where To Start

IAES Diagnosis and Treatment

The International Autoimmune Encephalitis Society offers patients and families detailed information on diagnosis and treatment.

Last updated on 04-27-20

Name: American Cancer Society 250 Williams Street NW
Atlanta, GA, 30329, United States
Toll Free: 1-800-227-2345 Url:
Name: American Autoimmune Related Diseases Association (AARDA) 22100 Gratiot Avenue
Eastpointe, MI, 48021, United States
Phone: 586-776-3900 Toll Free: 800-598-4668 Fax : 586-776-3903 Email: Url:
Name: International Autoimmune Encephalitis Society United States Phone: 352-527-2470 Email: Url:

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