Breakthrough PainAdministration, BuccalFentanylLabor PainAnalgesics, OpioidPainAnalgesia, EpiduralPain MeasurementNeoplasmsDouble-Blind MethodChronic DiseaseBreast NeoplasmsPain ManagementChronic PainPain, IntractablePain ThresholdLung NeoplasmsPain, PostoperativeRadionuclide GeneratorsPrognosisTreatment OutcomeBack PainLow Back PainEarly Detection of CancerProstatic NeoplasmsOvarian NeoplasmsRetrospective StudiesStomach NeoplasmsAbdominal PainTumor Markers, BiologicalNeoplasm StagingNeoplasm MetastasisNeck PainAntineoplastic AgentsFollow-Up StudiesProspective StudiesColorectal NeoplasmsColonic NeoplasmsPelvic PainSurvival AnalysisPain PerceptionAntineoplastic Combined Chemotherapy ProtocolsFacial PainSurvival Rate