• Hanneke Poort, Winette T A van der Graaf, Ronald Tielen, Myrella Vlenterie, José A E Custers, Judith B Prins, Constans A H H V M Verhagen, Marieke F M Gielissen, and Hans Knoop.
• Expert Center for Chronic Fatigue, Radboud University Medical Center, Nijmegen, The Netherlands. Electronic address: Hanneke.Poort@radboudumc.nl.
• J Pain Symptom Manage. 2016 Aug 1; 52 (2): 265-71.

ContextThe introduction of the tyrosine kinase inhibitor (TKI) imatinib in the treatment of gastrointestinal stromal tumor (GIST) in 2000 was the start of a new era of targeted treatment. Since then, the median survival of patients with GIST has substantially increased. Prolonged survival and chronic TKI use are associated with treatment-induced symptoms, such as fatigue, which can compromise quality of life (QoL).ObjectivesThis study determined the prevalence of severe fatigue in GIST patients compared to matched healthy controls, the impact of fatigue on daily life, and associations between fatigue and current TKI use.MethodsOne hundred nineteen patients treated with surgery and/or a TKI for GIST were asked to participate. Participants completed questionnaires including the Checklist Individual Strength-Fatigue Severity scale (CIS-fatigue), Short-Form 36-Item Health Survey, European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30, Fatigue Catastrophizing Scale, Self-Efficacy Scale, and the Hospital Anxiety and Depression Scale.ResultsEighty-nine GIST patients (75%) completed questionnaires, 61 patients (69%) were on a TKI. Prevalence of severe fatigue measured with CIS-fatigue was significantly higher in GIST patients (30%) than in 234 matched healthy controls (15%). The prevalence of severe fatigue did not differ significantly between patients receiving treatment with curative (29%) or palliative intent (36%). Severely fatigued patients reported lower QoL and more impairment on all functional domains. TKI use, more psychological distress, and lower physical functioning were associated with fatigue.ConclusionSevere fatigue occurs in 30% of GIST patients and in 33% of GIST patients on a TKI. The fatigue is disabling and is not only associated with current TKI use but also with psychological distress and physical functioning. GIST patients should be informed about these associated factors of fatigue that deserve appropriate management.Copyright © 2016 American Academy of Hospice and Palliative Medicine. Published by Elsevier Inc. All rights reserved.

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