GAPDH and central nervous system cancer: Analysis of the genetic status of TRIM3 in ASIII 098, GBM 157, and GBM 164 was assayed on DNA extracted from both the primary gliomas and peripheral blood mononuclear cells (PBMCs) derived from the same patients by Q-PCR of the reference-control gene GAPDH, as well as for Intron1, Exon 3, Intron 6, and Intron 11 of TRIM3, respectively (see Methods).