IDH1 and astrocytoma (excluding glioblastoma): Arrangement recommends IDH alteration happens right on time in tumors, followed by transformations like TP53 and ATRX in astrocytomas or 1p/19q co‐adjustment likely with CIC/FUBP1 in oligodendrogliomas (Cohen et al. 2015; Suzuki et al. 2015; Wakimoto et al. 2014).