E2 ModerateModerate confidencePEM not requiredCase-ControlPeer-reviewedMachine draft
Chronic fatigue in adult survivors of childhood cancer: associated symptoms, neuroendocrine markers, and autonomic cardiovascular responses.
Zeller, Bernward, Ruud, Ellen, Havard Loge, Jon et al. · Psychosomatics · 2014 · DOI
Quick Summary
This study looked at cancer survivors who experience chronic fatigue and compared them to survivors without fatigue. Researchers measured symptoms, stress hormones, and how the body responds to position changes. People with chronic fatigue reported more pain, confusion, and symptoms like heart palpitations and temperature sensitivity, though their heart responses to standing were similar to those without fatigue.
Why It Matters
This study bridges an important gap by examining whether chronic fatigue in cancer survivors shares biological mechanisms with ME/CFS, including neuroendocrine and autonomic dysfunction. Understanding these shared features could improve recognition and clinical management of post-cancer fatigue and inform understanding of fatigue pathophysiology more broadly.
Observed Findings
- CF cases reported significantly higher frequency of muscle/joint pain and cognitive symptoms (confusion/disorientation) compared to non-CF controls
- CF cases reported more autonomic symptoms including palpitations, intermittent heat and cold sensations, and watery diarrhea
- Plasma ACTH levels were significantly lower in CF cases (P=0.002)
- Urinary norepinephrine levels were significantly higher in CF cases (P=0.017)
- Orthostatic cardiovascular responses to head-up tilt testing did not significantly differ between CF and non-CF groups
Inferred Conclusions
- Chronic fatigue in cancer survivors shares symptom features with ME/CFS, including musculoskeletal pain, cognitive dysfunction, and autonomic symptoms
- Subtle dysregulation of the hypothalamic-pituitary-adrenal axis and increased sympathetic nervous activity may contribute to fatigue in this population
- The lack of difference in orthostatic cardiovascular responses suggests autonomic dysfunction in CF survivors may manifest differently than orthostatic intolerance
Remaining Questions
- What is the causal relationship between cancer treatment exposures and the development of chronic fatigue and associated neuroendocrine changes?
- Do the observed neuroendocrine alterations worsen over time or remain stable in cancer survivors with chronic fatigue?
What This Study Does Not Prove
This study does not prove that cancer survivors' fatigue is identical to ME/CFS or that cancer treatment causes ME/CFS. The neuroendocrine alterations are subtle and correlation does not establish causation. The cross-sectional design cannot determine whether biomarker changes preceded or resulted from fatigue symptoms.
Tags
Symptom:Cognitive DysfunctionOrthostatic IntolerancePainFatigueTemperature Dysregulation
Biomarker:Blood Biomarker
Phenotype:Gradual Onset
Method Flag:PEM Not DefinedWeak Case DefinitionSmall SampleMixed Cohort
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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