Table 1.

American Joint Committee on Cancer (AJCC) TNM staging of melanoma.

T Designation	Primary Tumor Thickness (mm)	N Designation	Regional Lymph Node	M Designation	Distant Metastasis
Tis	n/a	Nx	lymph node cannot be assessed	M0	no metastasis
T1	≤1.0	N1	1 lymph node	M1a	skin, cutaneous, distant lymph node
T2	1.0–2.0	N2	2-3 lymph nodes	M1b	lung
T3	2.0–4.0	N3	4+ lymph nodes	M1c	other visceral sites
T4	≥4.0			M1d	central nervous system