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This input is used in derivation
| Code | Description |
|---|---|
| 0 | No residual tumor |
| 1 | Residual tumor, NOS |
| 2 | Microscopic residual tumor |
| 3 | Macroscopic residual tumor |
| 7 | Margins not evaluable |
| 8 | No primary site surgery |
| 9 | Unknown or not applicable |
