Koos Boeve

57 SLNB in early oral cancer Table 1. Patient and tumour demographic characteristics Demographic Characteristics Overall, n (%) Histopathological status of SLNB p-value pN0, n (%) pN+ (%) Total 91 (100) 66 (100) 25 (100) NA Sex Male 43 (48) 32 (48) 11 (44) 0.815 Female 48 (52) 34 (52) 14 (56) Age at first treatment, y median (IQR) 62 (56-70) 61 (56-71) 64 (57-69) 0.996 Tumour location n(%) Tongue 52 (57) 35 (53) 17 (68) 0.111* FOM 27 (30) 23 (35) 4 (16) Cheek mucosa 8 (9) 5 (8) 3 (12) Upper gum 3 (3) 2 (3) 1 (4) Lower gum 1 (1) 1 (2) 0 (0) cT classification cT1 66 (73) 51 (77) 15 (60) 0.119 cT2 25 (27) 15 (23) 10 (40) pT classification pT1 73 (80) 57 (86) 16 (64) 0.036 pT2 18 (20) 9 (14) 9 (36) SLNB side Ipsilateral 57 (63) 40 (61) 17 (68) 0.701 Contralateral 1 (1) 1 (2) 0 (0) Both sides 33 (36) 25 (38) 8 (32) Number of SLNs per patient Median (IQR) 3 (2-4) 3 (2-4) 3 (2-4) 0.585 Tumour infiltration depth <4.59 mm 59 (65) 46 (70) 13 (52) 0.142 ≥4.59 mm 32 (35) 20 (30) 12 (48) Perineural invasion Yes 6 (7) 3 (5) 3 (12) 0.340 No 85 (93) 63 (95) 22 (88) Lymphovascular invasion Yes 9 (10) 6 (9) 3 (12) 0.702 No 82 (90) 60 (91) 22 (88)