- Design
- Systematic review and meta-analysis of cohort studies
- Population
- 27,473 patients with gastrointestinal cancers in 34 studies
- Primary outcome
- Postoperative complications, chemotherapy toxicity, length of stay
- Effect
- Postoperative complications OR 1.38 (1.11–1.72); stay +2.09 days (0.91–3.26)
A meta-analysis of 34 cohort studies with 27,473 patients with gastrointestinal cancers examined whether cachexia predicts treatment-related harm. Cachexia was associated with more postoperative complications (OR 1.38, 95% CI 1.11–1.72) and about two extra days in hospital (mean difference 2.09). It was not clearly associated with chemotherapy-related adverse events (OR 1.42, 0.57–3.54).
Heterogeneity was substantial throughout and the certainty of evidence very low, partly because cachexia was defined differently across studies. Radiotherapy toxicity and readmission could not be analysed.
The result supports what most surgeons already suspect, and it is a reason to measure weight loss and muscle mass before surgery rather than a basis for specific risk thresholds.
- Record weight loss and appetite at the first visit for every gastrointestinal cancer patient.
- Consider dietetic referral before surgery in patients with cachexia.
- Factor cachexia into consent discussions about postoperative recovery.
- No clear link with chemotherapy toxicity was found, but the estimate was imprecise.
Why it matters
Weight loss is easy to record and often missed in the rush to treatment.
Don't overread it
Very-low-certainty, heterogeneous observational data cannot show that treating cachexia reduces complications.
The statistics, in plain English
An odds ratio of 1.38 means about 38% higher odds of complications. For chemotherapy toxicity, the interval from 0.57 to 3.54 crosses 1.0, so no conclusion can be drawn.
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