Expression of Bmi-1 in Pediatric Brain Tumors as a New Independent Prognostic Marker of Patient Survival

Table 2

Univariate survival analysis (Kaplan-Meier): survival times according to clinicopathological features and the Bmi-1 gene expression.

	Case	Mean survival time; (months ± s.e.)	Chi-square	𝑃 value
Bmi-1 expression			5.87	0.015
High expression	24	20.31±3.84
Low expression	32	39.65±5.90
Sex			0.038	0.845
Male	30	35.28±7.43
Female	26	28.65±4.25
Embryonal/gliomas			1.88	0.17
Embryonal	16	36.23±6.06
Gliomas	40	23.53±4.01
Tumor grade			6.41	0.011
High grade	26	24.62±5.52
Low grade	30	34.44±3.23
Tumor type			1.43	0.21
Medulloblastoma	11	28.41±4.47
Astrocytomas	19	27.76±5.44
Ependymomas	16	19.46±4.48
Other	10	31.38±7.77