Table 2 Tumor properties of NPC used to define the proposed new staging system
2009 AJCC staging system | Proposed new staging system |
|---|---|
T: Tumor in the nasopharynx | T*: Tumor in the nasopharynx |
T1: Tumor confined to the nasopharynx, nasal cavity, or oropharynx | T1*: As per AJCC T1 and with tumor volume ≤38 cm3 |
T2: Tumor with parapharyngeal extension | T2*: As per AJCC T2 and/or T3, and with tumor volume ≤38 cm3 |
T3: Tumor that invades bony structures and/or the paranasal sinuses | T3*: As per AJCC T4 and/or all tumors with a volume >38 cm3 |
T4: Tumor with intracranial extension and/or involvement of the cranial nerve, infratemporal fossa, hypopharynx, or orbit |