KLK6 and neoplasm: According to the survival analysis, Kaplan–Meier survival analysis showed that patients with positive hK6 expression have lower OS (P = 0.002, Figure 2B), univariate analysis revealed that positive hK6 expression, TNM stage, tumor size, lymph node, T stage, and margin are important factors influencing the OS rates, when these factors were involved in a multivariate analysis (Table 4), TNM stage and hK6 were independent prognostic factors of OS.