Table 7. Anatomic Stage/Prognostic Groupsa
| Stage | T | N | M |
| 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. | |||
| 0 | Tis | N0 | M0 |
| IA | T1 | pN0 | M0 |
| IB | T1 | cN0 | M0 |
| IIA | T2/T3 | pN0 | M0 |
| IIB | T2/T3 | cN0 | M0 |
| IIC | T4 | N0 | M0 |
| IIIA | Any T | N1a | M0 |
| IIIB | Any T | N1b/N2 | M0 |
| IV | Any T | Any N | M1 |
