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Obesity Selectively Increases Intraoperative Risk in Left-Sided Colon Cancer Surgery: A Retrospective Cohort Study

Year: 2025

Type: article

Abstract: BACKGROUND: ) independently affected intraoperative and postoperative outcomes following colon cancer resection, and whether these effects varied by anatomical site. METHODS: ) and further grouped by urgency (elective or emergency) and anatomical subsite (right- vs left-sided). Primary outcomes were intraoperative complications, severe postoperative morbidity (Clavien-Dindo ≥ III), conversion to open surgery, ICU admission, and 30-day mortality. Multivariate logistic regression was used to adjust for confounders. RESULTS: Among the 737 patients, 33.5% were obese (BMI ≥ 30). Obese patients were younger and had higher rates of hypertension (55% vs 46%, p = 0.01), diabetes (25% vs 16%, p < 0.01), and respiratory disease (22% vs 11%, p < 0.01). In the overall cohort, obesity was not associated with increased rates of intraoperative complications, severe postoperative complications, conversion to open surgery, or 30-day mortality. In elective resections, obesity was independently associated with increased likelihood of ICU admission (aOR 1.82, 95% CI 1.08-3.09; p = 0.02), while in emergent resections obesity was independently associated with higher intra-operative complications (aOR 2.18, 95% CI 1.19-3.97; p = 0.01). Stratified analysis by resection site revealed that obesity was an independent risk factor associated with intraoperative complications (aOR 1.89, 95% CI 1.03-3.47; p = 0.04) and ICU admission (aOR 3.17, 95% CI 1.61-6.23; p < 0.01) following left-sided colectomy, but not right-sided surgery. CONCLUSIONS: Obesity was not associated with adverse outcomes following colon cancer surgery overall. However, when stratified by anatomical subsite, obesity was independently associated with increased perioperative risk in left-sided resections. These findings support a more nuanced approach to operative planning and perioperative risk stratification.

Source: International Journal of Colorectal Disease

DOI: 10.1007/s00384-025-04989-5