ArticleIn vivo (Athens, Greece)
Hereditary Diffuse Gastric Cancer With Poorly Differentiated Gallbladder Adenocarcinoma: A Case Report Suggesting Carcinogenesis in the Stomach and Gallbladder Caused by a Pathogenic Germline Variant in
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Abstract
BACKGROUND/
aimHereditary diffuse gastric cancer (HDGC) is an autosomal dominant cancer syndrome primarily characterized by a high lifetime risk of diffuse gastric cancer and lobular breast cancer. It is predominantly caused by inactivating germline variants in the tumor suppressor gene CASE REPORT: We present the case of a 67-year-old female initially referred for surgical management of gallbladder cancer (GBC) following an initial cholecystectomy for progressive wall thickening. Pathological examination of the gallbladder revealed a de novo, poorly differentiated adenocarcinoma invading the subserosal layer with reduced E-cadherin expression. Given the atypical histopathology and a significant family history-her father and brother both died of gastric cancer at young ages-a preoperative gastric endoscopy was performed. The endoscopy identified multiple faded mucosal lesions, which biopsy confirmed as signet-ring cell carcinoma. The patient subsequently underwent total gastrectomy and gallbladder bed resection. Postoperative pathology identified 22 distinct malignant gastric lesions, predominantly signet-ring cell carcinoma (pT1a), showing variable or lost E-cadherin expression. Germline genetic testing
conclusionThis represents the first reported case of synchronous HDGC and primary gallbladder adenocarcinoma associated with a germline
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