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¹Trakya Üniversitesi Tıp Fakültesi, Medikal Onkoloji Bilim Dalı, Edirne
²Trakya Üniversitesi Tıp Fakültesi, Nöroloji Anabilim Dalı, Edirne Guillain-Barre syndrome (GBS) is an acute inflammatory demyelinating polyradiculoneuropathy characterized by bilateral progressive symmetrical paralysis. GBS is rarely seen neuropathy in cancer patients. In the literature some cases of GBS associated with anticancer chemotherapy. In this case; the guillain-barre syndrome developed after the treatment of a 59-year-old male patient with metastatic small cell lung carcinoma who admitted to hospital with neutropenic fever after cisplatin/etoposide chemoteraphy regime is presented. The patients complained of bilteral progressive symmetrical paralysis in upper and lower limbs with depressed deep tendon reflexes and hypoesthesia. There was no pathological findings on electromyography. There was no a sign at radiological imaging that explained cranial and spinal mestastasis. The cerebrospinal fluid had albuminocytologic dissociation. Decline in tumoral lesions were detected on chest radiography. Accompanied by clinical and laboratory findings, a diagnosis of Guillain-Barre syndrome was considered. Semptoms completely disapperared after intravenous immunoglobulin for five days. Recurrence did not during follow-up. The patients was administered a total of 4 cycles of cisplatin / etoposide chemotherapy. The patient died due to disease progression six months later. We think that, in this case GBS was not a paraneoplatic syndrome because there was more than 50% tumor shrinkage. We propose GBS was induced by infection and chemotherapy rather than malignancy. Keywords : Guillain-Barre sydrome; small cell lung cancer; neuropathy