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Table 2 Tumor properties of NPC used to define the proposed new staging system

From: Impact of primary tumor volume and location on the prognosis of patients with locally recurrent nasopharyngeal carcinoma

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
  1. *Used to distinguish the tumor stage in the proposed new system from that in the American Joint Committee on Cancer (AJCC) staging system