Paraneoplastik Nörolojik Sendromlar
Özet
Paraneoplastik nörolojik sendromlar (PNS), sinir sistemi dışındaki sistemik kanserlerin nörolojik komplikasyonlarıdır ve doğrudan metastaz veya tedavi yan etkilerine bağlı olmaksızın, tümörün tetiklediği immün reaksiyonlarla ortaya çıkarlar. Bu sendromlar, 2019'da güncellenen PNS-Care paneli kriterlerine göre "yüksek", "orta" ve "düşük" riskli fenotipler ile antikorlar baz alınarak sınıflandırılmaktadır. Özellikle Küçük Hücreli Akciğer Kanseri (KHAK), meme kanseri ve lenfoma gibi malignitelerle sık ilişkilendirilen PNS, tümör hücresinin yüzey veya hücre içi antijenlerine karşı gelişen otoantikorlarla karakterizedir. Hücre içi antijenleri hedefleyen antikorlar (anti-Hu, anti-Yo vb.) genellikle T-hücresi aracılı kalıcı hasara yol açtığından tedaviye dirençlidir; plazma membran reseptörlerini hedefleyen antikorlar (anti-NMDAR vb.) ise antikor azaltıcı tedavilere (steroid, IVIg, plazma değişimi) daha iyi yanıt verir. Tanıda BOS incelemesi, MRG, PET-CT ve IgG antikor testleri kritik rol oynar. Sendromların klinik yönetimi; erken teşhisi, hızlı immünsüpresyonu ve altta yatan malignitenin zaman kaybetmeden tedavisini gerektirmektedir.
Paraneoplastic neurological syndromes (PNS) are neurological complications of systemic cancers originating outside the nervous system, arising from tumor-triggered immune reactions rather than direct metastasis or treatment side effects. Based on the updated 2019 PNS-Care panel criteria, these syndromes are classified by "high", "moderate", and "low" risk phenotypes and antibodies. Frequently associated with malignancies such as small cell lung cancer (SCLC), breast cancer, and lymphoma, PNS is characterized by autoantibodies generated against intracellular or surface neural antigens. Antibodies targeting intracellular antigens (anti-Hu, anti-Yo, etc.) involve T-cell-mediated irreversible damage and are typically resistant to treatment, whereas those targeting plasma membrane receptors (anti-NMDAR, etc.) respond better to antibody-depleting therapies like steroids, IVIg, and plasma exchange. CSF analysis, MRI, PET-CT, and IgG antibody testing play critical roles in diagnosis. Clinical management relies heavily on early detection, rapid immunosuppression, and immediate treatment of the underlying malignancy.
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