Table 2.

Summary of PFS and OS

Survival Analysis	Levels	Total	Failed	Censored	Median Time, y	95% CI
PFS	Overall	50	42	8	0.65	0.46	1.02
Histologic grade	I	8	6	2	1.02	0.46	3.82
	II	16	12	4	0.90	0.34	2.19
	III	20	18	2	0.47	0.15	1.36
Tumor location	Infratentorial	8	7	1	0.43	0.14	1.70
	Spinal cord	25	18	7	0.90	0.46	1.84
	Supratentorial	15	15	0	0.47	0.15	1.87
	Multiple regions	2	2	0	0.46	.	.
OS	Overall	50	30	20	2.25	1.70	3.97
Histologic Grade	I	8	4	4	3.97	1.50	.
	II	16	8	8	2.37	0.60	.
	III	20	15	5	1.76	0.85	2.92
Tumor Location	Infratentorial	8	5	3	2.04	0.40	.
	Spinal cord	25	12	13	3.63	1.76	.
	Supratentorial	15	11	4	2.02	0.74	2.92
	Multiple regions	2	2	0	1.22	.	.