The REST analysis of the target genes KIT, CSF1R, FLT3, PDGFRB, AXL and MET with the reference genes RPLPO, PPIA and TRFC showed the same significant results for the differential expression or at least the same trend in mutated and non-mutated GIST (data not shown). This evidence concerns the gene PDGFRB and gastrointestinal stromal tumor.