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Which are the causes of Paraneoplastic Neurologic Syndromes?

See some of the causes of Paraneoplastic Neurologic Syndromes according to people who have experience in Paraneoplastic Neurologic Syndromes

Paraneoplastic Neurologic Syndromes causes

Paraneoplastic Neurologic Syndromes (PNS) are a group of rare disorders that occur as a result of an immune response to an underlying cancer. These syndromes are characterized by neurological symptoms that are not directly caused by the tumor itself, but rather by the immune system's response to the tumor.



The exact cause of PNS is not fully understood, but it is believed to be related to the production of abnormal proteins by the tumor cells. These abnormal proteins, known as onconeural antigens, are expressed by both the tumor cells and normal neurons in the nervous system. The immune system recognizes these antigens as foreign and mounts an immune response against them, leading to damage to the nervous system.



There are several factors that contribute to the development of PNS:




  1. Tumor type: Certain types of cancers are more commonly associated with PNS. Small cell lung cancer, ovarian cancer, breast cancer, and lymphoma are among the most frequently reported tumor types.


  2. Onconeural antigens: The presence of specific onconeural antigens is a key factor in the development of PNS. Different types of PNS are associated with different onconeural antigens. For example, anti-Hu antibodies are commonly found in patients with PNS associated with small cell lung cancer.


  3. Immune response: The immune response triggered by the onconeural antigens plays a crucial role in the development of PNS. The immune system mistakenly attacks normal neurons expressing these antigens, leading to inflammation and damage to the nervous system.


  4. Genetic predisposition: Some individuals may have a genetic predisposition to developing PNS. Certain genetic factors may make individuals more susceptible to an autoimmune response against onconeural antigens.


  5. Tumor burden: The extent of tumor burden can influence the development of PNS. In some cases, PNS may occur when the tumor burden is minimal, while in others, it may be associated with advanced-stage cancer.



It is important to note that PNS is a rare condition, and not all individuals with cancer will develop these neurological syndromes. However, early recognition and diagnosis of PNS are crucial as they can significantly impact treatment decisions and patient outcomes.


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