Table 1.

Clinical and Histopathologic Categorization of Nasopharyngeal Carcinoma Cases

Clinical Staging		Histopathologic Typing
Stage II	8 (26.7%)	WHO type 1	9 (30%)
Stage III	12 (40%)	WHO type 2	6 (30%)
Stage IV	10 (33.3%)	WHO type 3	51 (50%)

Stage II (T₂N₀M₀)

Stage III (T₃N₀M₀-T_1,2 or₃,N₁M₀)

Stage IV (T₄N₀M₀-any T,N₂ or N₃,.M₀-any T, any N,M₁)

T1: Tumor confined to 1 site or no tumor visible

T2: Involving 2 sites (both posterosuperior and lateral wall)

T3: Extension into nasal cavity or oropharynx

T4: Tumor invasion of skull or cranial nerve involvement (or both)

N1: Metastasis in a single ipsilateral lymph node < 3 cm

N2: Metastasis in contralateral, bilateral, multiple lymph nodes or > 3 cm but < 6 cm

N2: Metastasis in lymph nodes > 6 cm

M0: No distant metastasis

M1: Distant metastasis.

WHO type 1: Squamous cell carcinoma

WHO type 2: Nonkeratinizing carcinoma

WHO type 3: Undifferentiated carcinoma that is lymphoepithelioma and anaplastic carcinoma