Head and Neck NeoplasmsRadiotherapyRadiotherapy DosageNeckHeadRadiotherapy, AdjuvantRadiotherapy, ConformalRadiotherapy, Intensity-ModulatedRadiotherapy Planning, Computer-AssistedCombined Modality TherapyRadiotherapy, High-EnergyNeck PainRadiation InjuriesDose FractionationRadiotherapy, Computer-AssistedRadiotherapy, Image-GuidedCarcinoma, Squamous CellTreatment OutcomeNeoplasmsNeoplasm StagingNeoplasm Recurrence, LocalRadiation OncologyPancreatic NeoplasmsLung NeoplasmsHead MovementsRetrospective StudiesNeoplasms, Second PrimaryDose-Response Relationship, RadiationRadiosurgeryBrachytherapyNeck InjuriesChemoradiotherapyNasopharyngeal NeoplasmsAntineoplastic Combined Chemotherapy ProtocolsFemur HeadFollow-Up StudiesTomography, X-Ray ComputedDisease-Free SurvivalSurvival RatePrognosisLaryngeal NeoplasmsNeoplasms, Radiation-InducedSurvival AnalysisBrain NeoplasmsCisplatinSkin NeoplasmsRadiation ToleranceRectal NeoplasmsFemoral Neck FracturesNeoplasms, Multiple PrimaryOrgans at RiskNeoplasms, Cystic, Mucinous, and SerousRadiation-Sensitizing AgentsBreast Neoplasms