OsteosarcomaBone NeoplasmsOsteosarcoma, JuxtacorticalFemoral NeoplasmsCell Line, TumorLeg BonesOsteoblastomaHumerusTumor Cells, CulturedOsteoblastsSarcoma, EwingMethotrexateGene Expression Regulation, NeoplasticChondrosarcomaDoxorubicinDog DiseasesLung NeoplasmsGenes, p53Cell ProliferationAntineoplastic AgentsTumor Suppressor Protein p53PrognosisNeoplasm MetastasisApoptosisCisplatinAmputationIfosfamide