T1 - < 2 cm

T2 – 2-4 cm

T3 - > 4 cm

T4 - > 4 cm, invasion of the base of the tongue or invasion of the mandible

N0 - 無淋巴侵犯

N1 -- single, homolateral, < 3 cm

N2 -

Ø   single, ipsilateral, 3-6 cm, or

Ø   multiple, ipsilateral, <6 cm, or

Ø   bilateral or contralateral lymph nodes, < 6 cm

ü   N2a - single ipsilateral lymph node, 3-6 cm

ü   N2b - multiple ipsilateral lymph nodes, < 6 cm

ü   N2c - bilateral or contralateral lymph nodes, < 6 cm

N3 - 至少有一顆lymph node > 6 cm

M0 - No metastases

M1 - Metastases