Central Nervous System CystsCheekColonic PouchesTumor Markers, BiologicalTumor Necrosis Factor-alphaTumor BurdenProctocolectomy, RestorativeCell Line, TumorDouglas' PouchPouchitisWilms TumorNeoplasms, ExperimentalGenes, Tumor SuppressorCarcinoid TumorTumor Suppressor Protein p53Neuroendocrine TumorsTumor Suppressor ProteinsBrain NeoplasmsTumor MicroenvironmentMesocricetusMammary Neoplasms, ExperimentalNeovascularization, PathologicAdenocarcinomaTransplantation, HeterologousNeoplasm MetastasisMacropodidaeGastrointestinal Stromal TumorsCell Proliferation