UCA1 and digestive system cancer: The results showed that increased UCA1 expression was also significantly associated with poor DFS (HR = 2.65, 95% CI: 1.59–4.43, P = 0.000, univariate analysis; HR = 2.50, 95% CI: 1.62–3.86, P = 0.000, multivariate analysis) (Figures 4(a) and 4(b)), indicating that increased UCA1 expression was an indicator of early tumor recurrence in digestive system cancer patients.