Version May 2024
| Primary tumor (T) | |||
| T category | T criteria | ||
| TX | Primary tumor cannot be assessed | ||
| T0 | No tumor identified, but EBV-positive cervical node(s) involvement | ||
| Tis | Tumor in situ | ||
| T1 | Tumor confined to nasopharynx, or extension to oropharynx and/or nasal cavity without parapharyngeal involvement | ||
| T2 | Tumor with extension to parapharyngeal space, and/or adjacent soft tissue involvement (medial pterygoid, lateral pterygoid, prevertebreal muscles) | ||
| T3 | Tumor with infiltration of bony structures at skull base, cervical vertebra, pterygoid structures, and/or paranasal sinuses | ||
| T4 | Tumor with intracranial extension, involvement of cranial nerves, hypopharynx, orbit, parotid gland, and/or extensive soft tissue infiltration beyond the lateral surface of the lateral pterygoid muscle | ||
| Regional lymph nodes (N) | |||
| N category | N criteria | ||
| NX | Regional lymph nodes cannot be assessed | ||
| N0 | No regional lymph node metastasis | ||
| N1 | Unilateral metastasis in cervical lymph node(s) and/or unilateral or bilateral metastasis in retropharyngeal lymph node(s), 6 cm or smaller in greatest dimension, above the caudal border of cricoid cartilage | ||
| N2 | Bilateral metastasis in cervical lymph node(s), 6 cm or smaller in greatest dimension, above the caudal border of cricoid cartilage | ||
| N3 | Unilateral or bilateral metastasis in cervical lymph node(s), larger than 6 cm in greatest dimension, and/or extension below the caudal border of cricoid cartilage | ||
| Distant metastasis (M) | |||
| M category | M criteria | ||
| M0 | No distant metastasis | ||
| M1 | Distant metastasis | ||
| Prognostic stage groups | |||
| When T is... | And N is... | And M is... | Then the stage group is... |
| Tis | N0 | M0 | 0 |
| T1 | N0 | M0 | I |
| T1, T0 | N1 | M0 | II |
| T2 | N0 | M0 | II |
| T2 | N1 | M0 | II |
| T1, T0 | N2 | M0 | III |
| T2 | N2 | M0 | III |
| T3 | N0 | M0 | III |
| T3 | N1 | M0 | III |
| T3 | N2 | M0 | III |
| T4 | N0 | M0 | IVA |
| T4 | N1 | M0 | IVA |
| T4 | N2 | M0 | IVA |
| Any T | N3 | M0 | IVA |
| Any T | Any N | M1 | IVB |
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