We found some of the genes significantly correlated between GBM models that were exclusive to either PDXs or cell lines were transcription factors, including DACH2, ELK3, FEV, GTF2H2B, KLF10, MAFK, REST, SALL4P5, and TFB1M, specific to PDXs and HSFX4, HSFY8P, MITF, MYCN, SP2, and YY2, specific to cell lines. The gene discussed is SALL4P5; the disease is glioblastoma.