Development of a shared T classification system based on invasion depth for biliary tract cancers at the cystic duct junction.
Identification that traditional site-based classifications (perihilar, distal, cystic duct cancers) inadequately stratify survival for tumors involving the cystic duct junction.
Depth-based staging (T1–T4) shows superior prognostic stratification with better discrimination of patient survival outcomes.
Proposal to group these tumors collectively as junctional cholangiocarcinoma (JCC) to improve clinical management consistency.
