IDH1 and astrocytoma (excluding glioblastoma): Interestingly, the copy number of EGFR as inferred by Oncomine analysis for these cases ranged from 2.74 to 4.6 with the copy number ratio of EGFR relative to the average copy number for the remaining genes sequenced by Oncomine on chromosome 7 was between 1.35 and 1.02, more indicative of the increased EGFR copy number being a result of broad chromosomal 7 gain, also a common feature of IDH-wildtype astrocytoma.