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Anti-Glial Fibrillary Acidic Protein (GFAP) are antibodies associated to inflammatory diseases of the central nervous system. The GFAP protein is highly expressed by astrocytes explaining these syndromes, but GFAP is also expressed by immature and non-myelinating Schwann cells. Thus, these antibodies could also lead to damages of the peripheral nervous system (PNS). Moreover, such damages have already been reported on small studies, and there is a need for larger cohorts.
The investigators will use the cohort of patients with neurological syndromes and anti-GFAP antibodies identified in the cerebrospinal fluid (CSF) of the "Reference center for paraneoplastic neurological syndromes and autoimmune encephalitis" to determine the frequency of the PNS involvement in these patients.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Patients presenting with neurological symptoms and anti-GFAP antibodies in the CSF. | This is a non-interventional study involving biological samples. Samples are already stored in biobank repositories and collected as part of "good clinical practice" in the diagnostic process of patients with suspected autoimmune encephalitis, meaning that the standard diagnostic and therapeutic approaches will not be altered in the selected study population. Patients have already gave explicit written consent for biological specimens sampling and storage at the "iological Resource Center of the Hospices Civils de Lyon" (CRB-HCL) (including tissue, cells or biological fluids). The group will be composed of patients included in the French cohort of patients with neurological syndromes and anti-GFAP antibodies in the CSF. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Clinical examination | Other | The examination performed by the clinician of the patient will be analyzed from the cohort as previously explained. |
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| Measure | Description | Time Frame |
|---|---|---|
| Cranial nerves abnormality at clinical examination of abnormal ENMG | Data concerning the clinical examination and the ENMG will be extracted from the cohort of patients with neurological syndroms and anti-GFAP antibodies identified in the cerebrospinal fluid (CSF) of the "Centre de reference des syndromes neurologiques paranéoplasiques et encéphalites auto-immunes". | Immediately after diagnosis |
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Inclusion Criteria:
Exclusion Criteria:
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120 patients presenting with neurological symptoms and with identified anti-GFAP antibodies in the CSF, included in the French cohort of patients with neurological syndroms and anti-GFAP antibodies identified in the cerebrospinal fluid (CSF) of the "Centre de reference des syndromes neurologiques paranéoplasiques et encéphalites auto-immunes", will be studied.
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Centre de référence des syndromes neurologiques paranéoplasiques et encéphalites autoimmunes | Lyon | 69677 | France |
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| ID | Term |
|---|---|
| D012149 | Restraint, Physical |
| ID | Term |
|---|---|
| D032763 | Behavior Control |
| D013812 | Therapeutics |
| D007103 | Immobilization |
| D008919 | Investigative Techniques |
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| electroneuromyography (ENMG) | Other | Data from the ENMGs will be extracted from the cohort and analyzed. |
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