However, the univariate and multivariate Cox proportional hazard model showed that CDCP1 positivity was significantly associated with recurrence within 5 years (HR, 1.967; 95 % CI: 1.104–3.504; p = 0.022) (Table 4); mortality was associated with old age (HR, 3.420; 95 % CI: 2.082–5.619; p < 0.001) and squamous cell carcinoma (HR, 1.907; 95 % CI: 1.181–3.081; p= 0.008) (Table S2). Here, CDCP1 is linked to squamous cell carcinoma.