Preoperative inflammatory indices associated with postoperative complications in colorectal cancer surgery patients.

This retrospective cohort study evaluated 1331 patients who underwent radical colorectal cancer surgery at a two-center setting in a specific region. The investigation focused on preoperative composite inflammatory indices, specifically SII, NLR, CLR, and SIRI, as exposures to assess risk of postoperative complications.

The primary outcome of postoperative complications occurred in 17.2% of the cohort, representing 229 of 1331 patients. Patients with complications exhibited a significantly more pronounced pro-inflammatory and immunosuppressive preoperative profile across all indices, with statistical significance implied as all P < 0.05. A model combining SII, NLR, CLR, and SIRI provides superior predictive performance compared to individual metrics for risk assessment of complications.

Safety data regarding adverse events, serious adverse events, discontinuations, and tolerability were not reported in the source material. The study design is observational, meaning causality is not explicitly claimed despite significant references to risk. Follow-up duration was not reported, limiting long-term assessment of outcomes.

Clinicians should interpret these findings as associations rather than causal relationships with caution. The evidence supports the predictive role of inflammatory indices but does not establish clinical utility beyond prediction. Further research is needed to validate these very important indices for routine preoperative risk stratification in clinical practice settings today.