Bed RestHead-Down TiltWeightlessness SimulationWeightlessness CountermeasuresRestCardiovascular DeconditioningSpace FlightBedsWeightlessnessTumor Markers, BiologicalTumor BurdenOrthostatic IntoleranceTumor Necrosis Factor-alphaCell Line, TumorLower Body Negative PressureWilms TumorTime FactorsNeoplasms, ExperimentalGenes, Tumor SuppressorCarcinoid TumorPhysiciansTumor Suppressor Protein p53Medical Staff, HospitalNeuroendocrine TumorsTumor Suppressor ProteinsBrain NeoplasmsBed OccupancyTumor MicroenvironmentPhysician-Patient RelationsMammary Neoplasms, ExperimentalMuscular AtrophySupine PositionMuscle, SkeletalNeovascularization, PathologicPlasma VolumeExerciseEarly AmbulationTreatment OutcomeNeoplasm MetastasisHypotension, OrthostaticAdenocarcinomaTransplantation, HeterologousAttitude of Health PersonnelGastrointestinal Stromal TumorsNeoplasmsCell ProliferationHypovolemiaXenograft Model Antitumor AssaysMice, Inbred BALB CFamily PracticeRNA, MessengerVascular CapacitanceAmino Acids, EssentialAntigens, NeoplasmImmobilizationMagnetic Resonance ImagingNeoplasm ProteinsColonic NeoplasmsCell DivisionMice, Inbred C57BL