BMI1 and brain neoplasm: The results of this analysis showed that the Bmi-1 gene expression (B = 0.827, standard error = 0.403, Wald = 4.207, relative rate = 2.287, and P < 0.05) and high grade/low grade (B = 0.751, standard error = 0.393, Wald = 3.647, relative rate = 2.118, and P < 0.05) were independent prognostic factors of a patient with pediatric brain tumor.