For the 2 studies with cut-off value of > = 30%, the sensitivity analysis in fixed effect model showed positive MUC1 expression indicated more CRC distant metastasis with the combined OR of 8.05 and 95% CI of 2.51–25.81 (χ2 = 0.47, P = 0.494, I2 = 0.0%, Fig 3C). The gene discussed is MUC1; the disease is colorectal carcinoma.