In the univariate analysis, tumor size ≤ 3 cm (P = 0.001), lymphatic invasion (P = 0.018), vascular invasion (P = 0.006), lymph node metastasis (P = 0.004), TNM stage (P = 0.004), grade of the adenocarcinoma component (P = 0.003) and CD56 positivity (P = 0.006) were associated with the outcome (Table 3). Here, NCAM1 is linked to adenocarcinoma.