UCA1 and colorectal cancer: The analysis between UCA1 expression and gender (P = 0.31, I2 %= 16 %), location (P = 0.80, I2 %= 0 %), differentiation grade (P = 0.12, I2 %= 45 %), lymphatic invasion(P = 0.73, I2 %= 0 %), venous invasion (P = 0.78, I2 %= 0 %), lymph node metastasis (P = 0.74, I2 %= 0 %), distant metastasis (P = 0.26, I2 %= 25 %), and TNM stage (P = 0.17, I2 %= 38 %) in colorectal cancer revealed no significant heterogeneity across studies, and thus the fixed-effects model was applied.