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The Association Between Myasthenia Gravis and Higher Extrathymic Cancer Risk
Mohamed Khateb1, Mai Abu Zant1, Alaa Bsoul1
1Department of Neurology, Rambam Medical Center, Haifa, Israel.
Brain and Behavior
|January 20, 2025
Summary
Myasthenia gravis (MG) is linked to a higher risk of extrathymic cancers, especially within five years of diagnosis. This suggests MG may act as a paraneoplastic disorder, warranting further investigation into cancer associations.
Area of Science:
- Neurology
- Oncology
- Immunology
Background:
- Myasthenia gravis (MG) is known to associate with thymic tumors.
- The relationship between MG and extrathymic cancers remains debated.
- Investigating MG as a potential paraneoplastic disorder for extrathymic cancers is crucial.
Purpose of the Study:
- To analyze the association between myasthenia gravis and extrathymic cancers.
- To determine if MG can be considered a paraneoplastic disorder for extrathymic cancers.
- To evaluate cancer rates and associations in a long-term MG cohort.
Main Methods:
- Retrospective analysis of 436 MG patients and 3924 controls over 23 years (2000-2023).
- Extraction of cancer rates, clinical, electrophysiological, and biochemical associations.
- Assessment of the impact of chronic medications on cancer risk.
Main Results:
- MG patients showed significantly higher rates of extrathymic cancers (p < 0.001) compared to controls.
- A relative cancer risk of 2.97 was observed in MG patients compared to rheumatology controls.
- Increased prevalence of extrathymic cancers was noted within the paraneoplastic time window (±5 years).
Conclusions:
- Myasthenia gravis is significantly associated with an increased risk of extrathymic cancers.
- The association is particularly strong within the paraneoplastic time window.
- Findings suggest Myasthenia gravis may function as a paraneoplastic disorder.
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