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Cytokine-Mediated Cancer Nausea — SCE Palliative Medicine MCQ

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HardNausea & VomitingCytokine-Mediated Cancer NauseaSCE Palliative Medicine

A 70‑year‑old woman with advanced lung cancer develops persistent nausea. Systematic assessment reveals: constant nausea (not movement‑related), no headache or papilloedema, no constipation, normal calcium and blood glucose, and no new medications. Her CRP is 85 mg/L and she has lost 5 kg in 2 weeks. What is the most likely mechanism?

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Correct answer: D — Cancer‑associated chronic nausea mediated by pro‑inflammatory cytokines (e.g. TNF‑α, IL‑1, IL‑6) acting on the area postrema/brainstem

The correct answer is D. Elevated inflammatory markers (CRP) and rapid weight loss without structural or metabolic causes make cytokine‑mediated nausea via action on the area postrema the most plausible. IL‑6, TNF‑α and related cytokines are known to be elevated in cancer cachexia and to affect central nausea pathways. Distractors: A is excluded (no new drugs), B is unlikely without neurological signs; D and E do not explain systemic inflammation or cachexia.

Reference: Sun et al., Area postrema neurons mediate IL‑6 function in cancer‑associated cachexia. Nat Commun. 2024; IL‑6, TNF‑α elevations in cachectic cancer (systematic review), J Cachexia Sarcopenia Muscle. 2022