Molecular genetics and diversity of choroid plexus tumors

Choroid plexus tumors are rare intraventricular brain tumors predominantly arising in children but also affecting adults. Chromosome-wide copy-number alterations and TP53 mutations do occur, but in most choroid plexus tumors, driver mutations have not been identified. Here we give a brief overview on the histopathological and clinical diversity of choroid plexus tumors and their genetic and epigenetic heterogeneity. Preliminary data indicate that choroid plexus carcinomas comprise at least two epigenetic subgroups, one of which is associated with TP53 mutation status. These findings strongly encourage us to further investigate the genetic and epigenetic heterogeneity in a larger cohort and to align molecular subgroup status with clinical annotations, in order to identify prognostic markers that may also aid stratification within future international trials.