Molecular Subtyping of Biliary Tract Neuroendocrine Carcinomas: Clinicopathological Features and Prognostic Implications.
Neuroendocrine carcinoma (NEC) of the biliary tract is an exceptionally rare and highly aggressive malignancy, and its molecular subtype landscape and diagnostic boundaries remain poorly defined. We retrospectively analyzed 42 biliary tract NECs, including 22 surgically resected cases, arising in the intrahepatic bile...