Ethnicity influences lymph node resection in colon cancer

Area of Science:

• Oncology
• Health Services Research
• Epidemiology

Background:

• Adequate lymph node retrieval is crucial for accurate colon cancer staging and prognosis.
• Current guidelines recommend examining at least 12 lymph nodes after colon cancer resection.
• Disparities in healthcare access and quality may influence surgical outcomes across different ethnic groups.

Purpose of the Study:

• To investigate the association between patient ethnicity and the number of lymph nodes retrieved during colon cancer resection.
• To determine if ethnic disparities exist in achieving the benchmark of ≥12 lymph nodes examined.
• To assess the impact of lymph node retrieval rates on cancer staging and survival across ethnic groups.

Main Methods:

• Utilized the Surveillance Epidemiology and End Results (SEER)-Medicare database for colon cancer resections between 2000-2003.
• Classified patients into two groups based on lymph node retrieval: <12 nodes (N=20,605) and ≥12 nodes (N=12,358).
• Employed multivariate models to analyze the relationship between ethnicity and lymph node yield, controlling for other variables.

Main Results:

• A majority of patients (62.5%) had fewer than 12 lymph nodes resected.
• Hispanic patients were significantly less likely to have ≥12 lymph nodes retrieved compared to Caucasian patients (OR=0.61; CI, 0.50-0.74).
• Despite lower lymph node counts in Hispanic patients, there was no significant difference in the proportion of Stage II and III diagnoses, nor in cancer-directed surgery rates or survival.

Conclusions:

• Ethnicity appears to be an independent factor influencing lymph node retrieval rates in colon cancer surgery.
• While Hispanic ethnicity is associated with fewer retrieved lymph nodes, this did not translate to understaging or poorer survival outcomes in this cohort.
• Further research is needed to understand the clinical implications of these findings and ensure equitable cancer care across all ethnic populations.