Risk of Local Recurrence After Complete Mesocolic Excision for Right-Sided Colon Cancer: Post-Hoc Sensitivity...

Area of Science:

• Oncology
• Surgical Oncology
• Gastroenterology

Background:

• Complete mesocolic excision (CME) has demonstrated a causal effect on reducing recurrence risk in right-sided colon cancer.
• However, the specific contribution of CME to reducing local recurrence risk remains unclear.

Purpose of the Study:

• To quantify the extent to which complete mesocolic excision influences the risk of local recurrence in right-sided colon cancer.
• To assess the causal effect of CME on local and distant recurrence rates.

Main Methods:

• Post-hoc analysis of a population-based cohort from Denmark (2010-2013).
• Utilized inverse probability of treatment weighting and competing risk analyses.
• Included 807 patients undergoing elective colon resections for right-sided colon cancer without distant metastases.

Main Results:

• The 5.2-year cumulative incidence of solely local recurrence was 3.7% after CME versus 7.0% after conventional resection (absolute risk reduction: 3.7%).
• CME also showed significant absolute risk reductions for local and distant recurrence (3.4%) and solely distant recurrence (3.1%).
• The study found a causal treatment effect of CME on solely local recurrence and distant recurrence.

Conclusions:

• Complete mesocolic excision causally reduces the risk of solely local recurrence in right-sided colon cancer.
• CME also demonstrates a causal effect on reducing the risk of distant recurrence, whether occurring alone or with local recurrence.