title: Could Objective Tests Be Used to Measure Fatigue in Patients With Advanced Cancer?
abstract: Assessment of cancer-related fatigue is currently based on patient-reported outcomes. We asked whether objective assessments, such as muscle strength and nutritional markers, can be used as surrogate measures of cancer-related fatigue.
  
  
  
  We examined the association among three fatigue scales, muscle strength, and nutritional markers in patients with advanced cancer.
  
  
  
  In this prospective study, we enrolled hospitalized cancer patients who had been seen in palliative care consultation at MD Anderson Cancer Center. We assessed fatigue using three fatigue scales-the Brief Fatigue Inventory (BFI), the Edmonton Symptom Assessment System (ESAS), and the European Organization for Research and Treatment of Cancer Quality of Life Core Questionnaire 30 (EORTC QLQ-C30)-and determined their association with objective assessments, including handgrip strength, maximal inspiratory pressure, lean body mass, phase angle, and albumin. Spearman's correlation test was used to assess associations.
  
  
  
  Among 222 patients, the mean age was 55 years; 59% were women. The median overall survival was 106 days. The total BFI score had weak association with handgrip strength (ρ = -0.18, P = 0.007) and no association with the remaining objective measures. ESAS fatigue and EORTC fatigue showed similar findings. Total BFI had moderate-to-strong association with ESAS (ρ = 0.54, P < 0.0001) and EORTC (ρ = 0.60, P < 0.0001) fatigue.
  
  
  
  Our study showed that subjective assessment of fatigue based on patient-reported outcomes correlates only weakly with muscle strength and nutritional markers; thus, patient-reported outcomes remain the gold standard for fatigue assessment.
authors.affiliation: Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Schvartsman
authors.affiliation: Division of Quantitative Sciences, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
authors.forename: Minjeong
authors.initials: M
authors.lastname: Park
authors.affiliation: Division of Quantitative Sciences, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
authors.forename: Diane D
authors.initials: DD
authors.lastname: Liu
authors.affiliation: Department of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
authors.forename: Sriram
authors.initials: S
authors.lastname: Yennu
authors.affiliation: Department of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Bruera
authors.affiliation: Department of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA. Electronic address: dhui@mdanderson.org.
authors.forename: David
authors.initials: D
authors.lastname: Hui
mesh_terms: D000328:Adult; D000368:Aged; D005221:Fatigue / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy; D005260:Female; D018737:Hand Strength; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology* / Q000628:therapy; D009752:Nutritional Status; D010166:Palliative Care; D011446:Prospective Studies; D012709:Serum Albumin; D012720:Severity of Illness Index; D055815:Young Adult
chemical_list: D012709:Serum Albumin
keywords: Electric impedance; fatigue; muscle strength; neoplasms; palliative care; patient outcome assessment