Table 3.

Recommended simplified T classification based on the 8th edition of the UICC/AJCC staging system for nasopharyngeal carcinoma

	The T classification of the 8th edition of the UICC/AJCC staging system	A simplified T classification based on the 8th edition of the UICC/AJCC staging system
T0	No tumor identified, but EBV-positive cervical node(s) involvement	No tumor identified, but EBV-positive cervical node(s) involvement
T1	Tumor confined to nasopharynx, or extension to oropharynx and/or nasal cavity without parapharyngeal involvement	Tumor confined to nasopharynx, or beyond the nasopharynx without parapharyngeal involvement
T2	Tumor with extension to parapharyngeal space and/or adjacent soft tissue involvement (medial pterygoid, lateral pterygoid, prevertebral muscles)	Tumor with extension to parapharyngeal space
T3	Tumor with infiltration of bony structures at skull base, cervical vertebra, pterygoid structures, and/or paranasal sinuses	Tumor with infiltration of bony structures at skull base
T4	Tumor with intracranial extension, involvement of cranial nerves, hypopharynx, orbit, parotid gland, and/or extensive soft tissue infiltration beyond lateral surface of the lateral pterygoid muscle	Tumor with intracranial extension, involvement of cranial nerves, parotid gland, and/or extensive soft tissue infiltration beyond lateral surface of the lateral pterygoid muscle

Abbreviations: UICC/AJCC,  Union for International Cancer Control/American Joint Committee on Cancer;  EBV,   Epstein-Barr virus.