Is there a difference in survival between right- versus left-sided colon cancers?

Area of Science:

• Oncology
• Epidemiology
• Cancer Research

Background:

• Increasing incidence of right-sided colon cancers noted.
• Prognostic variation by tumor location remains unclear.
• Study compares survival outcomes for right- versus left-sided colon cancers.

Purpose of the Study:

• To compare survival rates between right-sided and left-sided colon cancers.
• To investigate potential differences in patient prognosis based on tumor location.
• To analyze long-term survival outcomes in a population-based cohort.

Main Methods:

• Retrospective survival analysis using the Surveillance, Epidemiology, and End Results (SEER) database (1988-2003).
• Inclusion of subjects with pathologically confirmed invasive colon adenocarcinoma who underwent surgical resection.
• Cox proportional hazard regression analysis to compare survival, controlling for confounders.

Main Results:

• Analysis of 77,978 subjects with colon adenocarcinoma.
• Median survival: 78 months for right-sided vs. 89 months for left-sided cancers (P < .001).
• Right-sided colon cancers associated with a 5% increased mortality risk (HR, 1.04; 95% CI, 1.02-1.07) after controlling for confounders.

Conclusions:

• Right-sided colon cancers demonstrate a worse prognosis compared to left-sided colon cancers.
• The underlying reasons for this disparity are currently unclear.
• Findings are particularly relevant due to the rising incidence of right-sided colon cancers.