OsteosarcomaBone NeoplasmsOsteosarcoma, JuxtacorticalFemoral NeoplasmsCell Line, TumorChild WelfareDisabled ChildrenChild BehaviorLeg BonesOsteoblastomaHumerusTumor Cells, CulturedSarcoma, EwingOsteoblastsMethotrexateChondrosarcomaDoxorubicinDog DiseasesGene Expression Regulation, NeoplasticChild Health ServicesChild RearingLung NeoplasmsAntineoplastic AgentsPrognosisCell ProliferationChild, InstitutionalizedTreatment OutcomeNeoplasm MetastasisChild Behavior DisordersRetrospective StudiesChild PsychologyApoptosisAmputationIfosfamideCisplatinChild of Impaired Parents