In the sensitivity analysis on tumor size, it was found that excluding the studies of Lv et al. [26] and Wu et al. [23] completely eliminated heterogeneity (P = 0.63, I2 = 0%), and there was a significant correlation between high PCAT6 expression and tumor size (OR = 5.86; 95% CI, [3.46, 9.90]; P < 0.00001). Here, PCAT6 is linked to neoplasm.