Heparan Sulfate Proteoglycans/metabolism; Heparan Sulfate Proteoglycans/pharmacology; Neoplastic Stem Cells/metabolism; Neoplastic Stem Cells/pathology; Neuroblastoma/drug therapy; Neuroblastoma/metabolism; Animals; Antineoplastic Agents/chemistry; Antineoplastic Agents/pharmacology; Binding Sites; Cell Differentiation/drug effects; Cell Line, Tumor; Female; Fibroblast Growth Factor 2/metabolism; Heparin/analogs & derivatives; Heparin/chemistry; Heparin/metabolism; Heparin/pharmacology; Humans; Inhibitor of Differentiation Protein 1/metabolism; Mice; Mice, SCID; Mitogen-Activated Protein Kinase Kinases/metabolism; Neoplastic Stem Cells/drug effects; Neuroblastoma/pathology; Prognosis; Receptor, Fibroblast Growth Factor, Type 1/metabolism; Signal Transduction; Stromal Cells/metabolism; Xenograft Model Antitumor Assays