ERG and neoplasm: While the chromosomal translocation point within the introns of these genes is variable [72], ~85% of ES tumour cells express mRNA transcripts containing the exons 1–7 of EWSR1 fused to the last four or five exons of FLI1; ~10% of cases have the EWSR1-ERG fusion of exons 1–7 of EWSR1 and from the sixth exon onwards of ERG [69].