FLT1 (that encodes the VEGFR1 protein) is expressed as an indirect downstream effect of FUS-CHOP expression in both FUS-CHOP transfected HT1080 (fibrosarcoma) and MLPS cell lines however, VEGFR tyrosine kinase inhibitors did not have a notable impact on proliferation in MLPS cell lines indicating a separate role in these cells [112, 113]. This evidence concerns the gene FLT1 and fibrosarcoma.