Retrospective Study of Selective Submandibular Neck Dissection versus Radical Neck Dissection for N0 or N1 Necks in Level I Patients with Oral Squamous Cell Carcinoma

Table 1

Characteristics of patients (elective neck dissection versus observation).

	Elective neck dissection	Observation	P value
Primary tumor site			0.565
Tongue	41 (37.3%)	43 (36.1%)
Lower gum	44 (40.0%)	38 (31.9%)
Upper gum	10 (9.1%)	13 (10.9%)
Buccal mucosa	9 (8.2%)	14 (11.8%)
Oral floor	3 (2.7%)	8 (6.7%)
Others	3 (2.7%)	3 (2.5%)
Clinical primary tumor stage
cT1/2	78 (70.9%)	86 (72.3%)	0.467
cT3/4	32 (29.1%)	33 (27.7%)
Tumor differentiation
Poorly differentiated	7 (6.4%)	6 (5.0%)	0.788
Moderately differentiated	32 (29.1%)	39 (32.8%)
Well differentiated	71 (64.5%)	74 (62.2%)
Neoadjuvant chemoradiotherapy	38 (34.5%)	42 (35.3%)	0.508
Total	110	119