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Myasthenia Gravis

Myasthenia Gravis and Kidney Cancer

04/01/2002

Question:

Dr. Kaminski; My husband was diagnosed with kidney cancer six months ago and underwent a complete removal of the kidney. He is NED at this time. Since then he has been in a clinical trial to try to extend his disease free time. In the trial the white blood cells are removed and treated with IL-2 and re-infused into the pt. Two weeks ago Ron, my husband was diagnosed with Myasthenia Gravis. Do you think the clinical trial could have caused the MG to appear at this time? Also, do you think the trial should be continued? The doctors at the trial feel that the two are unrelated, but I would like your oppinion. Thank you so much. We feel we have worked so hard to conqure the cancer that we may have caused the MG. Any comment?

Answer:

Interleukin-2 (IL-2) is a medication that influences activities of the immune system and the naturally produced substance has been shown to be involved the pathogenesis of myasthenia gravis in animals with experimentally induced myasthenia gravis and in human myasthenia gravis. In patients who may be susceptible to the development of myasthenia gravis, treatment with IL-2 could be a factor in the development of MG. Below is a paper that describes a patient treated with IL-2 and interferon who developed myasthenia gravis. Please share my response with your physicians. Consideration needs to be given to the risks of continued treatment versus risk of worsening MG. It is important to appreciate that this complication is unlikely to apply to other patients and that risk of MG with IL-2 is likely to be very low.

Rohde D, Sliwka U, Schweizer K, Jakse G. Oculo-bulbar myasthenia gravis induced by cytokine treatment of a patient with metastasized renal cell carcinoma. Eur J Clin Pharmacol 1996; 50:471-3.

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Response by:

Case Western Reserve University Henry J Kaminski, MD
Formerly, Professor of Neurology
Department of Neurology
School of Medicine
Case Western Reserve University
Henry J Kaminski, MD