Table 1.

Number of Each Genetic Subtype Included for Fresh Tissue, Cryosections and Formalin-Fixed Paraffin-Embedded (FFPE) Sections, Subdivided into 3-Group Model and 2-Group Model

Genetic subtypes (WHO grade)	Tissue preparation
	Fresh tissue		Cryosections		FFPE sections
	3-grp model	2-grp model	3-grp model	2-grp model	3-grp model	2-grp model
Astrocytoma, IDH-wild-type (All WHO IV (GB))	36	36	19	19	41	41
Astrocytoma, IDH-mutant (WHO II/WHO III/WHO IV (GB))	21 (4/7/10)	26	41 (12/10/19)	60	51 (8/12/31)	79
Oligodendroglioma (WHO II/WHO III)	5 (3/2)		19 (8/11)		28 (12/16)
Total	62		79		120

GB = glioblastoma; grp = group; IDH = isocitrate dehydrogenase; WHO = World Health Organization.