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Melanoma Treatment (PDQ®)

  • Updated: 03/19/2014

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.
TXPrimary tumor cannot be assessed (e.g., curettaged or severely regressed melanoma).
T0No evidence of primary tumor.
TisMelanoma in situ.
T1Melanomas ≤1.0 mm in thickness.
T2Melanomas 1.01–2.0 mm.
T3Melanomas 2.01–4.0 mm.
T4Melanomas >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≤1.0a: w/o ulceration and mitosis <1/mm2.
b: with ulceration or mitoses ≥1/mm2.
T21.01–2.0a: w/o ulceration.
b: with ulceration.
T32.01–4.0a: w/o ulceration.
b: with ulceration.
T4>4.0a: w/o ulceration.
b: with ulceration.