Interrogating the cBioportal (http://www.cbioportal.org/, accessed on 23 July 2017) and PeCan data portals (https://pecan.stjude.org/home, accessed on 23 July 2017), 10 mutations in ABCB1 and three in ABCG2 genes in were identified in glioblastoma alone (Figure 2 and Figure 3). Here, ABCG2 is linked to glioblastoma.