Regional Failures after Selective Neck Dissection in Previously Untreated Squamous Cell Carcinoma of Oral Cavity

Table 6

Prognostic variables for 5-year regional control.

Prognostic factor	Number (𝑛)	5-year regional control (%)	𝑃 value
Tumor grade
Well	110	84	0.006
Mod	84	87
Poorly	25	62
Lymphovascular invasion
Positive	12	68	0.044
Negative	153	85
Unknown	54	85
Perineural invasion
Positive	28	75	Not significant
Negative	140	84
Unknown	51	84
Pathological N stage
N0	114	95	<0.0001
N+	105	81
Pathological T stage
T1-T2	186	82	Not significant
T3-T4	33	91
Number of positive nodes
1, 2	57	70	Not significant
3, 4, 5	26	71
>5	22	61