As already reported [13], murine fibrosarcoma MC17-51 cells, that express very low levels of PTX3, were transfected with a pBABE-Puro vector, possibly harboring the full length human PTX3 cDNA sequence, to generate PTX3-overexpressing MC17-51 (PTX3-MC17-51) or control/mock (mock-MC17-51) cells, respectively. This evidence concerns the gene PTX3 and fibrosarcoma.