IDH1 and central nervous system cancer: Patients with wildtype glioma (IDH‐wt) are generally older and more often have cognitive deficits (Wefel, Noll, Rao, & Cahill, 2016), even though they less often have epileptic seizures that are generally linked to poorer cognitive functioning (Chen et al., 2017; Klein, Engelberts, et al., 2003).