Table 1.

Staging System Schemas

AJCC / UICC
T1	< 5 cm in greatest dimension
T2	≥ 5 cm in greatest dimension (a: superficial; b: deep)
N0 vs. N1	(Any nodal disease)
M0 vs. M1	(Any distant metastases)
G1	Well-differentiated
G2	Moderately differentiated
G3	Poorly differentiated
G4	Undifferentiated
I	G1-2, T1a-b or T2a, N0, M0
II	G1-2, T2b, N0, M0 or G3-4, T1a-b / T2a, M0
III	G3-4, T2b, N0, M0 or N1 (any G, any T)
IV	Any M1
MSK
Unfavorable signs	≥ 5 cm in greatest dimension Deep invasion High grade
Stage 0	0 Unfavorable signs
Stage I	1 Unfavorable sign
Stage II	2 Unfavorable signs
Stage III	3 Unfavorable signs
Stage IV	Any metastases (nodal or distant)