• Gustavo Schvartsman, Minjeong Park, Diane D Liu, Sriram Yennu, Eduardo Bruera, and David Hui.
• Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
• J Pain Symptom Manage. 2017 Aug 1; 54 (2): 237-244.

ContextAssessment 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.ObjectiveWe examined the association among three fatigue scales, muscle strength, and nutritional markers in patients with advanced cancer.MethodsIn 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.ResultsAmong 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.ConclusionOur 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.Copyright © 2017 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.

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