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Paraneoplastic Syndrome: Causes & Treatment

Paraneoplastic syndrome refers to symptoms triggered by a malignant tumor without the tumor directly invading the affected tissue.

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Things worth knowing about "Paraneoplastic Syndrome"

Paraneoplastic syndrome refers to symptoms triggered by a malignant tumor without the tumor directly invading the affected tissue.

What is Paraneoplastic Syndrome?

Paraneoplastic syndrome (PNS) is an umbrella term for symptoms and disorders that are indirectly caused by a malignant tumor. Unlike direct tumor effects such as pain from compression or metastases, these symptoms arise from substances secreted by the tumor or from an abnormal immune response that mistakenly attacks the body's own tissues. The syndrome can affect almost any organ system and frequently appears before the tumor itself is diagnosed, making it an important clinical warning sign.

Causes and Mechanisms

Paraneoplastic syndromes develop through two primary mechanisms:

Hormonal or biochemical: Some tumors produce hormones or hormone-like substances (ectopic hormone production) that trigger effects not normally associated with the tissue of origin. For example, lung tumors may secrete antidiuretic hormone (ADH) or adrenocorticotropic hormone (ACTH).
Immunological: The immune system generates antibodies against tumor antigens. These antibodies mistakenly attack healthy body tissue, especially the nervous system. This leads to what is known as paraneoplastic neurological syndromes.

Tumor types commonly associated with paraneoplastic syndromes include:

Small cell lung carcinoma
Breast cancer (mammary carcinoma)
Ovarian carcinoma
Thymoma (tumor of the thymus)
Hodgkin lymphoma

Symptoms

The symptoms of paraneoplastic syndrome are highly diverse, as virtually every organ system can be involved. The most common manifestations include:

Neurological Symptoms

Paraneoplastic encephalomyelitis: Memory impairment, confusion, personality changes
Cerebellar degeneration: Balance disorders, loss of coordination (ataxia), double vision
Polyneuropathy: Tingling, numbness, or weakness in the limbs
Lambert-Eaton syndrome: Muscle weakness, particularly of the legs

Endocrine Symptoms

Cushing syndrome due to ectopic ACTH production: weight gain, high blood pressure, elevated blood sugar
Syndrome of inappropriate ADH secretion (SIADH): Hyponatremia (low sodium), nausea, confusion
Hypercalcemia from PTHrP production: bone pain, fatigue, kidney problems

Hematological and Dermatological Symptoms

Thrombosis and increased bleeding tendency
Acanthosis nigricans (dark, velvety skin thickening)
Dermatomyositis (muscle inflammation with skin involvement)

Diagnosis

Diagnosing paraneoplastic syndrome can be challenging because symptoms are often nonspecific and can mimic many other conditions. The following investigations are commonly used:

Blood tests: Detection of paraneoplastic antibodies (e.g., anti-Hu, anti-Yo, anti-NMDAR), hormone measurements (ACTH, ADH, PTHrP), electrolytes (sodium, calcium)
Imaging: CT, MRI, or PET-CT to identify the underlying tumor
Lumbar puncture (spinal tap): Examination of cerebrospinal fluid if neurological involvement is suspected
Electrophysiology: Nerve conduction studies for neuropathies
Biopsy: Tissue sampling to determine tumor type

Importantly, if typical paraneoplastic antibodies are detected, a thorough search for an underlying tumor must be initiated, even if no tumor has yet been identified.

Treatment

The most important treatment is addressing the underlying tumor. Successful tumor therapy (surgery, chemotherapy, radiation, or immunotherapy) can significantly improve or completely resolve paraneoplastic symptoms.

Additional treatment options include:

Immunosuppressive therapy: Corticosteroids, plasmapheresis (blood purification), intravenous immunoglobulins (IVIG), or rituximab for immune-mediated forms
Symptomatic treatment: Physical therapy, pain management, electrolyte correction depending on the affected organ systems
Hormonal countermeasures: For example, mineralocorticoid antagonists in ACTH-excess-related Cushing syndrome

Prognosis depends greatly on tumor type, disease stage, and which organ systems are affected. Early recognition and treatment significantly improve outcomes.

References

Dalmau J, Rosenfeld MR. Paraneoplastic syndromes of the CNS. Lancet Neurology. 2008;7(4):327-340.
Graus F et al. Recommended diagnostic criteria for paraneoplastic neurological syndromes. Journal of Neurology, Neurosurgery & Psychiatry. 2004;75(8):1135-1140.
National Cancer Institute (NCI). Paraneoplastic Syndromes. U.S. Department of Health and Human Services, 2023.

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