EGFR and glioblastoma: Counter-intuitively, if we run GISTIC2 on smaller subsets (<577) of the Glioblastoma data set, we do actually detect EGFR. The reason is that GISTIC2 calls regions wider for smaller sample sizes (Fig. 2c), but ironically falls prey to passenger aberrations that ‘distract' from the true driver aberration at larger sample sizes.