Cell Line, Tumor|Data Interpretation, Statistical|Databases, Bibliographic|Epidermal Growth Factor|Gene Expression Regulation, Neoplastic|Glioblastoma|Humans|Lysophospholipids|Matrix Metalloproteinase 9|Neoplasm Invasiveness|Neovascularization, Pathologic|Oligonucleotide Array Sequence Analysis|Protein Interaction Mapping|Sphingosine