An autopsy case of lung adenocarcinoma with immune checkpoint inhibitor-induced pneumonia and fulminant myocarditis following pembrolizumab administration: a case report

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Abstract
Immune checkpoint inhibitors (ICIs) are the current standard of care for non-small-cell lung cancer (NSCLC). Myocarditis is a rare but serious immune-related adverse event (irAE) associated with ICI therapy. We present a patient who received a single dose of pembrolizumab for NSCLC and developed ICI-associated pneumonia. Although pneumonia improved with corticosteroid therapy, the patient subsequently developed ICI-associated fulminant myocarditis. Despite high-dose corticosteroid therapy, the patient died on day 30 after pembrolizumab initiation. Even if an observed irAE was effectively treated, clinicians should remain vigilant for other irAEs, especially those that are difficult to control with low-dose corticosteroids.

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