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Case Reports
Journal Article
Lung adenocarcinoma associated with familial adenomatous polyposis. Clear cell carcinoma with beta-catenin accumulation accompanied by atypical adenomatous hyperplasia.
A 46-year-old man presented with a lung tumor 17 years after a subtotal colectomy and 13 years after a partial duodenectomy for familial adenomatous polyposis (FAP). There had been no malignant transformation in the specimens from his colectomy and duodenectomy, and a current gastrointestinal investigation revealed no evidence of malignancy. Pathological analysis of the lung tumor demonstrated adenocarcinoma with clear cells and a papillary structure, accompanied by tiny tumorous nodules in the background lung parenchyma. Many of the nodules were multifocal adenocarcinoma; however, some of the nodules demonstrated atypical adenomatous hyperplasia (AAH). This is the first case report of a lung adenocarcinoma accompanied by AAH in a FAP patient. Immunohistochemical and loss of heterozygosity studies revealed unique features of the lesions reflecting a disruption of the adenomatous poliposis coli-beta-catenin pathway.
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