Table 3.
Definition of T according to AJCC 8th edition [1].
| Category | Thickness | Ulceration |
|---|---|---|
|
| ||
| TX: Primary tumor cannot be assessed | N/A | N/A |
|
| ||
| T0: No evidence of primary tumor | N/A | N/A |
|
| ||
| Tis (in situ) | N/A | N/A |
|
| ||
| T1 | ≤1 mm | |
|
|
||
| T1a | <0.8 mm | Without ulceration |
|
|
||
| T1b | <0.8 | With ulceration |
| 0.8–1.0 mm | With or without ulceration | |
|
| ||
| T2 | >1.0–2.0 mm | |
|
|
||
| T2a | >1.0–2.0 mm | Without ulceration |
|
|
||
| T2b | >1.0–2.0 mm | With ulceration |
|
| ||
| T3 | >2.0–4.0 mm | |
|
|
||
| T3a | >2.0–4.0 mm | Without ulceration |
|
|
||
| T3b | >2.0–4.0 mm | With ulceration |
|
| ||
| T4 | >4.0 mm | |
|
|
||
| T4a | >4.0 mm | Without ulceration |
|
|
||
| T4b | >4.0 mm | With ulceration |