Genes that were expressed at significantly higher levels in hemangiosarcomas than in non-hemangiosarcoma tumors (osteosarcoma, non-Hodgkin lymphoma, and leukemia) included VEGFA, TIMP-1, FN-1, ADAM9, PDGFC, MMP14, TNFα, and acid ceramidase, which also were more highly expressed in hemangiosarcomas than splenic hematomas. This evidence concerns the gene TIMP1 and leukemia.