Impact of Surgical Stress Response on Long-Term Outcomes in Robot-Assisted vs Laparoscopic Colon Cancer Surgery

Overview

This nationwide cohort study analyzed the association between perioperative surgical stress, measured by postoperative C-reactive protein (CRP) levels, and long-term oncological outcomes in patients undergoing robot-assisted surgery (RAS) versus laparoscopic surgery (LAS) for UICC stage I–III colon cancer. The findings suggest that RAS is associated with a reduced surgical stress response and improved long-term survival compared to LAS.

Background

Surgical resection remains the cornerstone treatment for resectable colon cancer, with minimally invasive techniques such as robot-assisted surgery (RAS) and laparoscopic surgery (LAS) increasingly utilized. RAS offers improved ergonomics, better visualization, and reduced perioperative surgical stress compared to LAS. The surgical stress response, characterized by the release of stress hormones and proinflammatory cytokines, may influence micrometastatic progression and long-term cancer outcomes. Biomarkers like CRP are used to monitor systemic inflammation postoperatively and have been linked to survival outcomes in colorectal cancer patients.

Data Highlights

The study included adult patients with UICC stage I–III colon cancer undergoing intended curative RAS or LAS between 2010 and 2018, identified from the Danish Colorectal Cancer Group Database. Postoperative CRP levels were measured to assess surgical stress response. Propensity score matching was applied to balance baseline characteristics between groups. Recurrence and mortality data were obtained from national registries with validated algorithms. The analysis focused on associations between surgical approach, CRP response, cancer recurrence, and all-cause mortality.

Key Findings

• Robot-assisted surgery (RAS) was associated with a significantly lower postoperative CRP response compared to laparoscopic surgery (LAS), indicating reduced surgical stress.
• Patients undergoing RAS demonstrated improved long-term overall survival and colorectal cancer-specific survival relative to those treated with LAS.
• A pronounced postoperative CRP response correlated with higher risks of cancer recurrence and decreased survival across both surgical groups.
• Propensity score matching confirmed that the observed survival benefits with RAS were not attributable to baseline confounding factors.
• The study supports the hypothesis that reduced perioperative surgical trauma and inflammation may contribute to better oncological outcomes.

Clinical Implications

Monitoring postoperative CRP levels can provide valuable prognostic information regarding long-term outcomes in colon cancer surgery. The reduced surgical stress response observed with robot-assisted surgery may translate into improved survival, supporting its increasing adoption for colon cancer resections. Clinicians should consider the potential benefits of RAS in minimizing systemic inflammation and possibly reducing cancer recurrence risk.

Conclusion

This nationwide cohort analysis demonstrates that robot-assisted colon cancer surgery is associated with a lower surgical stress response and improved long-term oncological outcomes compared to laparoscopic surgery. These findings highlight the importance of perioperative inflammation in cancer prognosis and support the clinical value of RAS in colon cancer treatment.

References

1. Danish Colorectal Cancer Group Database -- Data Source
2. Lash et al. -- Algorithm for Recurrence Identification
3. STROBE Statement -- Guidelines for Observational Studies