Six patient groups (NT = normal tissue -control, WT = wild type, Ex9 = KIT Exon 9 mutated, Ex11 = KIT Exon 11 mutated, NF1 = wild type and neurofibromatosis type 1, Ex18 = PDGFRA Exon 18 mutated) were used to analyze the gene expression of KIT, FLT3, CSF1-R, PDGFRB, AXL and MET. Here, the REST analysis with POLR2A is shown exemplarily. Here, NF1 is linked to neurofibromatosis type 1.