PLPPR1 and glioblastoma: Among the 251 candidates, C8orf46, FAM115A, GPR56, HMP19, LPPR1, MAGED4B, MLLT4, NGFRAP1, PTCHD2, and SEPT7 (red crosses in Figure 2d) were not expressed by the normal cells, indicating specificity to GBM stem-like cells compared with normal brain cells.