TABLE 1.

The characteristics of include cohorts.

Characteristics	TCGA (n = 508)		CGGA (n = 444)		Samples (n = 29)
	N	%	N	%	N	%
Age (y)
≤40	251	49.41	229	51.58	6	20.69
>40	257	50.59	214	48.20	23	79.31
NA	0	0.00	1	0.23	0	0.00
Gender
Female	282	55.51	193	43.47	6	20.69
Male	226	44.49	251	56.53	23	79.31
Grade
II	246	48.43	189	42.57	12	41.38
III	262	51.57	255	57.43	17	58.62
Histological type
A	128	25.20	271	61.04	9	31.03
OA	188	37.01	30	6.76	0	0.00
O	192	37.80	142	31.98	3	10.34
NA	0	0.00	1	0.23	17	58.62
IDH1 status
Wildtype	34	6.69	96	21.62	6	20.69
Mutation	91	17.91	307	69.14	18	62.07
NA	383	75.39	41	9.23	5	17.24
Radiation therapy
Yes	142	27.95	315	70.95	0	0.00
No	119	23.43	102	22.97	0	0.00
NA	247	48.62	27	6.08	29	100.00
Chemotherapy
Yes	277	54.53	285	64.19	0	0.00
No	229	45.08	132	29.73	0	0.00
NA	2	0.39	27	6.08	29	100.00

A, astrocytoma; IDH1, isocitrate dehydrogenase 1; NA, not available; O, oligodendroglioma; OA, oligoastrocytoma.