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Table 1: Lesion characteristics
Total Number of Subjects (%) Number of Subjects with T1–T2 Lesions (%)
Histologic type 
 Squamous cell carcinoma 23 (77%) 8 (80%)
 Adenoid cystic carcinoma 4 (13%) 1 (10%)
 Adenocarcinoma 1 (3%) 1 (10%)
 Sarcoma 1 (3%) 
 Melanoma metastasis 1 (3%) 
Tumor stage 
 pT1 4 (13%) 4 (40%)
 pT2 6 (20%) 6 (60%)
 pT3 1 (3%) 
 pT4 16 (53%) 
Lymph node stage 
 pN0 12 (38%) 
 pN1 5 (17%) 
 pN2a 1 (3%) 
 pN2b 6 (20%) 
 pN2c 1 (3%) 
 pN3 0 
Initial tumor location 
 Base of tongue 1 (3%) 
 Tongue 6 (20%) 2 (20%)
 Floor of mouth 4 (13%) 3 (30%)
 Vestibule or lip 2 (7%) 
 Maxillary 2 (7%) 
 Palate 3 (10%) 
 Mandibular 8 (27%) 
 Amygdala 1 (3%) 3 (30%)
 Salivary glands 3 (10%) 2 (20%)
Staging 
 Initial diagnosis 23 (77%) 6 (60%)
 Recurrence 7 (23%) 4 (40%)

	Total Number of Subjects (%)	Number of Subjects with T1–T2 Lesions (%)
Histologic type
Squamous cell carcinoma	23 (77%)	8 (80%)
Adenoid cystic carcinoma	4 (13%)	1 (10%)
Adenocarcinoma	1 (3%)	1 (10%)
Sarcoma	1 (3%)
Melanoma metastasis	1 (3%)
Tumor stage
pT1	4 (13%)	4 (40%)
pT2	6 (20%)	6 (60%)
pT3	1 (3%)
pT4	16 (53%)
Lymph node stage
pN0	12 (38%)
pN1	5 (17%)
pN2a	1 (3%)
pN2b	6 (20%)
pN2c	1 (3%)
pN3	0
Initial tumor location
Base of tongue	1 (3%)
Tongue	6 (20%)	2 (20%)
Floor of mouth	4 (13%)	3 (30%)
Vestibule or lip	2 (7%)
Maxillary	2 (7%)
Palate	3 (10%)
Mandibular	8 (27%)
Amygdala	1 (3%)	3 (30%)
Salivary glands	3 (10%)	2 (20%)
Staging
Initial diagnosis	23 (77%)	6 (60%)
Recurrence	7 (23%)	4 (40%)