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Cutaneous Squamous Cell / Other Cutaneous Carcinoma

Primary Tumor (T)
T Category	Stage Category Definitions
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
Tis	Carcinoma in situ
T1	Tumor 2 cm or less in greatest dimension with less than two high risk features**
T2	Tumor greater than 2 cm in greatest dimension or Tumor any size with two or more high risk features*
T3	Tumor with invasion of maxilla, orbit, or temporal bone
T4	Tumor with invasion of skeleton (axial or appendicular) or perineural invasion of skull base

* Excludes cSCC of the eyelid.
**High Risk Features for the Primary Tumor (T) Staging :
Depth/Invasion: > 2 mm thickness, Clark level ≧ IV, Perineural invasion
Anatomic Location: Primary site ear, Primary site hair-bearing lip
Differentiation: Poorly differentiated or undifferentiated

Regional Lymph Nodes (N)
N Category	Stage Category Definitions
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Metastasis in a single ipsilateral lymph node, 3 cm or less in greatest dimension
N2	Metastasis in a single ipsilateral lymph node, more than 3 cm but not more than 6 cm in greatest dimension; or in multiple ipsilateral lymph nodes, none more than 6 cm in greatest dimension; or in bilateral or contralateral lymph nodes, none more than 6 cm in greatest dimension
N2a	Metastasis in a single ipsilateral lymph node, more than 3 cm but not more than 6 cm in greatest dimension
N2b	Metastasis in multiple ipsilateral lymph nodes, none more than 6 cm in greatest dimension
N2c	Metastasis in bilateral or contralateral lymph nodes, none more than 6 cm in greatest dimension
N3	Metastasis in a lymph node, more than 6 cm in greatest dimension

Distant Metastasis (M)
M Category	Stage Category Definitions
M1	Distant metastasis

No distant metastasis (no pathologic M0; use clinical M to complete stage group)

Anatomic Stage/Prognostic Groups
Stage	T	N	M
0	Tis	N0	M0
I	T1	N0	M0
II	T2	N0	M0
III	T3	N0	M0
III	T1	N1	M0
III	T2	N1	M0
III	T3	N1	M0
IV	T1	N2	M0
IV	T2	N2	M0
IV	T3	N2	M0
IV	Any T	N3	M0
IV	T4	Any N	M0
IV	Any T	Any N	M1