Table 1. Frequency of IDH1-R132H and ATRX loss in gliomas.

Histology	IDH			ATRX			IDH_R132H+ATRX_loss
	total	R132H	frequency	total	loss	frequency	R132H	loss	frequency
A	64	37	57.81	64	49	76.56	37	34	91.89
AA	27	13	48.15	27	21	77.78	13	10	76.92
O	12	9	75.00	12	1	8.33	9	1	11.11
AO	9	5	55.56	9	1	11.11	5	1	20.00
OA	49	40	81.63	49	23	46.94	40	21	52.50
AOA	68	38	55.88	68	20	29.41	38	15	39.47
pGBM	114	17	14.91	114	14	12.28	17	5	29.41
sGBM	59	40	67.80	59	45	76.27	40	36	90.00

Abbreviations: A, astrocytoma; AA, anaplastic astrocytoma; O, oligodendroglioma; AO, anaplastic oligodendroglioma; OA, oligoastrocytoma; AOA, anaplastic oligoastrocytoma; pGBM, primary glioblastoma; sGBM, secondary glioblastoma; IDH, isocitrate dehydrogenase, ATRX, alpha-thalassemia/mental retardation, X-linked.