2002 American Joint Committee on Cancer (AJCC) TNM Staging System for the Skin Cancer

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
T2: Tumor more than 2 cm but not more than 5 cm in greatest dimension
T3: Tumor more than 5 cm in greatest dimension
T4: Tumor invades deep extradermal structures (i.e., cartilage, skeletal muscle, or bone)

Nx: Regional lymph nodes cannot be assessed
N0: No regional lymph node metastasis
N1: Regional lymph node metastasis

Stage 0: Tis N0 M0
Stage I: T1 N0 M0
Stage II: T2 N0 M0, T3 N0 M0
Stage III: T4 N0 M0, Any T N1 M0
Stage IV: Any T Any N M1