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Proposed new stage grouping for distal cholangiocarcinoma that incorporates depth of tumor invasion
| T classification | N classification | Stage |
|---|---|---|
| T1 (depth of invasion, <5 mm) | N0 | I |
| T2 (depth of invasion, 5–12 mm) | N0 | II |
| T3 (depth of invasion, >12 mm) | N0 | III |
| Any T (T1, T2, or T3) | N1 | III |
