Mixed Tumor, MalignantMixed Tumor, MesodermalNeoplasms, Complex and MixedAdenoma, PleomorphicMyoepitheliomaMammary Neoplasms, AnimalDog DiseasesCarcinosarcomaMesenchymomaVaginal NeoplasmsSalivary Gland NeoplasmsSubmandibular Gland NeoplasmsAdenosarcomaParotid NeoplasmsProstateinMixed Tumor, MullerianDogsOssification, HeterotopicKeratinsImmunohistochemistryVimentinCarcinomaTumor Markers, BiologicalMetaplasiaTumor BurdenTumor Necrosis Factor-alphaCell Line, TumorWilms TumorNeoplasms, ExperimentalGenes, Tumor SuppressorCarcinoid TumorTumor Suppressor Protein p53Neuroendocrine TumorsTumor Suppressor ProteinsBrain NeoplasmsTumor MicroenvironmentMammary Neoplasms, ExperimentalNeovascularization, PathologicNeoplasm MetastasisAdenocarcinomaTransplantation, HeterologousGastrointestinal Stromal TumorsXenograft Model Antitumor AssaysCell ProliferationMice, Inbred BALB CAntigens, Neoplasm