[Pubmed] Clinical features, diagnosis, and management of pembrolizumab-induced myasthenia gravis

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[Pubmed] Clinical features, diagnosis, and management of pembrolizumab-induced myasthenia gravis

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Clin Exp Immunol. 2022 Nov 25:uxac108. doi: 10.1093/cei/uxac108. Online ahead of print.

ABSTRACT

Myasthenia gravis (MG) is a rare but life-threatening adverse event with pembrolizumab. What is known about pembrolizumab-induced MG is largely based on case reports. This analysis collected pembrolizumab-induced MG cases from Chinese and English databases published from September 1, 2014, to June 30, 2022. Demographic and clinical information of the patients, management, and outcome data were collected and analyzed. Sixty-five patients with a median age of 73 years (range 30- 86), including 43 male patients (66.2%), were included. Eight patients (12.3%) with prior MG experienced worsening symptoms after receiving pembrolizumab. The median time to the onset of MG was four weeks (range 0.7-27). The most common symptoms were ptosis (81.5%, 53 patients), diplopia (50.8%, 33 patients), dyspnea (44.6%, 29 patients), trunk or peripheral weakness (43.1%, 28 patients), and dysphagia (30.8%, 20 patients). Concurrent myositis and myocarditis occurred in 13 (20.0%) and 17 patients (26.2%). Pembrolizumab was discontinued in 63 patients (96.9%). Forty-four patients (67.7%) received combination therapies based on steroids (intravenous immune globulin, plasmapheresis, or immunosuppressants). Twenty-seven patients (41.5%) had symptoms completely recovered. Fourteen patients (21.5%) died from immunotoxicity or primary cancers. Clinicians should consider the possibility of pembrolizumab-induced MG, especially during the first eight weeks of therapy. Patients should be treated as early as possible, regardless of the severity of the initial symptoms.

PMID:36426591 | DOI:10.1093/cei/uxac108


Source: https://pubmed.ncbi.nlm.nih.gov/3642659 ... 5&v=2.17.8
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