- Design
- Systematic review and meta-analysis of cohort studies
- Population
- 34 studies, 27,473 patients with gastrointestinal cancer
- Primary outcome
- Treatment-related adverse outcomes
- Effect
- Postoperative complications OR 1.38 (1.11–1.72); length of stay +2.09 days (0.91–3.26)
A systematic review and meta-analysis in Supportive Care in Cancer pooled 34 cohort studies (27,473 patients) on cancer cachexia and treatment-related adverse outcomes in gastrointestinal cancers.
Cachexia was associated with higher odds of postoperative complications (OR 1.38) and about two days' longer hospital stay. There was no significant association with chemotherapy-related adverse events (OR 1.42, CI crossing 1). Heterogeneity was substantial throughout and the certainty of evidence very low; no studies addressed radiotherapy toxicity.
Association is not proof that treating cachexia prevents complications. But identifying it before surgery is cheap — weight loss history, BMI and simple strength or muscle measures — and it is a reason to involve a dietitian early and plan prehabilitation where time allows.
- Record unintentional weight loss and BMI in every patient planned for GI cancer surgery.
- Refer patients with cachexia for nutritional assessment before surgery where timing allows.
- Consider prehabilitation programmes combining nutrition and exercise.
- Factor cachexia into discussions of surgical risk and recovery time.
Why it matters
Cachexia is common in GI cancer and often goes unrecorded until after complications arise.
Don't overread it
The evidence is observational and of very low certainty; it does not show that treating cachexia lowers complications.
The statistics, in plain English
An OR of 1.38 means about 38% higher odds of postoperative complications. Substantial heterogeneity means studies disagreed on the size of the effect.
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