Table 1 shows that tumor differentiation (p = 0.022, p = 0.007, respectively), serum CA19-9 (p = 0.036, p = 0.028, respectively) and YY1 expression (p = 0.004, p = 0.032, respectively) were significant independent risk factors for predicting the prognosis of PDAC patients. Here, YY1 is linked to neoplasm.