Table 1. Primary Tumor (T)a
| aReprinted with permission from AJCC: Melanoma of the skin. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 325-44. | ||
| TX | Primary tumor cannot be assessed (e.g., curettaged or severely regressed melanoma). | |
| T0 | No evidence of primary tumor. | |
| Tis | Melanoma in situ. | |
| T1 | Melanomas ≤1.0 mm in thickness. | |
| T2 | Melanomas 1.01–2.0 mm. | |
| T3 | Melanomas 2.01–4.0 mm. | |
| T4 | Melanomas >4.0 mm. | |
| Note: a and b subcategories of T are assigned based on ulceration and number of mitoses per mm2 as shown below: | ||
| T classification | Thickness (mm) | Ulceration Status/Mitoses |
| T1 | ≤1.0 | a: w/o ulceration and mitosis <1/mm2. |
| b: with ulceration or mitoses ≥1/mm2. | ||
| T2 | 1.01–2.0 | a: w/o ulceration. |
| b: with ulceration. | ||
| T3 | 2.01–4.0 | a: w/o ulceration. |
| b: with ulceration. | ||
| T4 | >4.0 | a: w/o ulceration. |
| b: with ulceration. | ||
