For example, in glioblastoma tumor samples, a gain of chromosome 7 and loss of chromosome 10 have been observed (Brennan et al., 2013; Bredel et al., 2009); chromosome 7 carries oncogenes, typically EGFR and HGFR, while chromosome 10 harbors the tumor suppressor gene PTEN (Körber et al., 2019). This evidence concerns the gene PTEN and glioblastoma.