Extension Size Pair AJCC 6 Table
Notes
**Note**: For CS Extension codes 150-180, 635, and 640, the T category for AJCC 6 staging is assigned based on the values of tumor basal diameter, recorded in CS Site-Specific Factor 2, and thickness, recorded in CS Site-Specific Factor 3. Diameter and thickness are mapped to tumor size pairs in the Tumor Size Pair AJCC 6 Table, and the CS Extension codes and tumor size pairs are mapped to T as shown in this table.| CS Extension | Tumor Size Pair | AJCC 6 T |
|---|---|---|
| 150, 160 | 1 | T1a |
| 170, 180 | 1 | T1b |
| 635, 640 | 1 | T1c |
| 150, 160 | 2 | T2a |
| 170, 180 | 2 | T2b |
| 635, 640 | 2 | T2c |
| 150, 160 | 3 | T3 |
| 170, 180, 635, 640 | 3 | T4 |
| 150, 160, 170, 180, 640 | 9 | TX |
| 635 | 9 | T1c |
| CS Extension | Tumor Size Pair | AJCC 6 T |
|---|---|---|
| 150 | 1 | T1a |
| 160 | 1 | T1a |
| 170 | 1 | T1b |
| 180 | 1 | T1b |
| 635 | 1 | T1c |
| 640 | 1 | T1c |
| 150 | 2 | T2a |
| 160 | 2 | T2a |
| 170 | 2 | T2b |
| 180 | 2 | T2b |
| 635 | 2 | T2c |
| 640 | 2 | T2c |
| 150 | 3 | T3 |
| 160 | 3 | T3 |
| 170 | 3 | T4 |
| 180 | 3 | T4 |
| 635 | 3 | T4 |
| 640 | 3 | T4 |
| 150 | 9 | TX |
| 160 | 9 | TX |
| 170 | 9 | TX |
| 180 | 9 | TX |
| 635 | 9 | T1c |
| 640 | 9 | TX |