UCA1 and cancer: A significant association was observed between high UCA1 level and poor OS in patients with all 10 types of cancer (pooled HR = 1.85, 95% CI 1.62–2.10, p < 0.001) and no obvious heterogeneity existed across 19 studies under a fixed effect model (I2 = 0.0%, pH = 0.905) in Figure 2A.