AGNA-1 (Anti-Glial Nuclear Antibody-1)
What is AGNA-1?
AGNA-1 stands for Anti-Glial Nuclear Antibody-1, an autoantibody that targets proteins found in the nuclei of glial cells—supportive cells in the brain and spinal cord. It is part of a group of paraneoplastic antibodies, which means it can signal that the immune system is reacting to an underlying cancer, especially when there are neurological symptoms.
Why is AGNA-1 tested?
AGNA-1 is primarily tested when someone has unexplained neurological symptoms that may be due to an autoimmune reaction triggered by cancer. It helps doctors identify a paraneoplastic neurologic syndrome (PNS)—a condition where the immune system attacks the nervous system in response to a tumor elsewhere in the body.
What does a positive AGNA-1 result mean?
A positive AGNA-1 test is highly associated with small cell lung cancer (SCLC) and may appear before the cancer is diagnosed. It can serve as an important early warning sign for both cancer and neurologic involvement.
If you test positive for AGNA-1:
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Your doctor may recommend further cancer screening (especially of the lungs)
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Additional neurological tests may be ordered to check for nervous system involvement
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Early treatment may improve outcomes or prevent worsening symptoms
Does a negative result rule out cancer or neurological disease?
No. A negative AGNA-1 result does not completely rule out cancer or autoimmune neurological conditions. If symptoms persist, other paraneoplastic or phenotype-specific antibody tests may be needed.
Why is AGNA-1 important?
AGNA-1 can help connect otherwise unexplained neurological symptoms to a hidden cancer. Detecting it early may lead to faster diagnosis and treatment of both the cancer and the neurological condition.
AGNA-1
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