Systemic AA Amyloidosis Following Immune Checkpoint Inhibitor Therapy for Lung Carcinosarcoma: An Autopsy Case and Review of the Literature
Year: 2026
Type: article
Study design: Case Report
Abstract: AA amyloidosis is a rare but serious complication of chronic inflammation. We report an autopsy case of a 68-year-old man without a documented history of inflammatory disease who developed lung carcinosarcoma and achieved a durable complete response after sequential immune checkpoint inhibitor (ICI) therapy. Despite tumor control, the patient developed a chronic intestinal pseudo-obstruction, persistent C-reactive protein elevation, progressive renal dysfunction, and later aspiration pneumonia. Autopsy revealed systemic AA amyloid deposition, predominantly in the intestines and kidneys, chronic thyroiditis, and tubulointerstitial nephritis. This case raises the possibility that prolonged inflammation during and after ICI therapy contributes to systemic AA amyloidosis.
Source: Internal Medicine
Institutions: Hokkaido University, Hokkaido University Hospital
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: diamond
OpenAlex ID: W7204111871