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Merkel Cell Carcinoma Treatment (PDQ®)

  • Updated: 03/07/2014

Table 3. Primary Tumor (T)a

aReprinted with permission from AJCC: Merkel cell carcinoma. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 315-23.
TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor (e.g., nodal/metastatic presentation without associated primary).
TisIn situ primary tumor.
T1≤2 cm maximum tumor dimension.
T2>2 cm but ≤5 cm maximum tumor dimension.
T3>5 cm maximum tumor dimension.
T4Primary tumor invades bone, muscle, fascia, or cartilage.