Table 2.
N Category | T Category | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
T0 Occult primary tumor | T1a < 0.8 | T1b < 0.8 U or 0.8–1.0 | T2a >1.0–2.0 | T2b >1.0–2.0 U | T3a >2.0–4.0 | T3b >2.0–4.0 U | T4a >4.0 | T4b >4.0 U | ||
N1a | 1 node c.o. | N/A | A | A | A | B | B | C | C | C |
N1b | 1 node c.d | B | B | B | B | B | B | C | C | C |
N1c | only S/T mets | B | B | B | B | B | B | C | C | C |
N2a | 2/3 node c.o. | N/A | A | A | A | B | B | C | C | C |
N2b | 2/3 node, at least 1 c.d. | C | B | B | B | B | B | C | C | C |
N2c | S/T mets + 1 nodea | C | C | C | C | C | C | C | C | C |
N3a | ≥4 node c.o. | N/A | C | C | C | C | C | C | C | D |
N3b | ≥4 node, at least 1 c.d. or matted nodes | C | C | C | C | C | C | C | C | D |
N3c | S/T mets + ≥2 nodea or matted nodes | C | C | C | C | C | C | C | C | D |
c.o. = clinically occult (diagnosed by sentinel node biopsy); c.d. = clinically detected (by palpation or imaging); N/A = not applicable. S/T mets = satellite and/or in-transit metastases. T category is expressed in mm.U = ulceration;
in N2c and N3c subcategories involved nodes may be either clinically occult or clinically detected.
Adapted from: Gershenwald JE, Scolyer RA, Hess KR, et al. Melanoma staging: evidence-based changes in the American Joint Committee on Cancer eighth edition cancer staging manual. CA Cancer J Clin. 2017; doi:10.3322/caac.21409.