[pubmed] Relationship between anti-acetylcholine receptor antibodies and the development of post-thymectomy myasthenia g

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[pubmed] Relationship between anti-acetylcholine receptor antibodies and the development of post-thymectomy myasthenia g

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Gland Surg. 2021 Aug;10(8):2408-2413. doi: 10.21037/gs-21-287.

ABSTRACT

BACKGROUND: Approximately 15-29.6% of patients with thymoma have myasthenia gravis (MG). Some of these patients develop MG after thymectomy despite having no history of MG or related symptoms. Few previous studies have examined the risk factors for the development of post-thymectomy MG in patients with thymoma. Herein, we retrospectively reviewed our institutional experience with patients with thymoma who developed MG after thymectomy.

METHODS: Twenty-six patients with thymoma but without MG, who were tested preoperatively for anti-acetylcholine receptor antibody (anti-AChR-Ab) levels, underwent surgical resection at our hospital between 2013 and 2020. Patients with thymic carcinoma were excluded from the study. We evaluated the association of outcomes with preoperative anti-AChR-Ab levels and post-thymectomy MG. We performed a χ2 test for bivariate analysis of categorical data. Differences were considered significant at P0.3 nmol/L) preoperative anti-AChR-Ab levels. Post-thymectomy MG occurred in two of the five patients (40%) with high preoperative anti-AChR-Ab levels. A high preoperative serum anti-AChR-Ab titer was significantly associated with post-thymectomy MG (P=0.0267). The anti-AChR-Ab titer was also measured postoperatively in four of the five (80%) patients with high preoperative levels. The anti-AChR-Ab titer decreased in two of these four patients, and neither developed postoperative MG.

CONCLUSIONS: Preoperative and postoperative anti-AChR-Ab positivity might be associated with post-thymectomy MG. Therefore, regular measurement of anti-AChR-Ab levels after thymectomy is required.

PMID:34527552 | PMC:PMC8411078 | DOI:10.21037/gs-21-287


Source: https://pubmed.ncbi.nlm.nih.gov/3452755 ... 1&v=2.14.5
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