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Population-based study to re-evaluate optimal lymph node yield in colonic cancer.

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Optimal lymph node (LN) yield in colon cancer surgery impacts prognosis. Higher LN counts improve staging accuracy and survival outcomes, suggesting yields beyond 20 LNs are beneficial for patients.

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Area of Science:

  • Oncology
  • Surgical Pathology
  • Cancer Research

Background:

  • Lymph node (LN) yield in colon cancer resection is a known prognostic factor.
  • Optimal LN yield for accurate staging and improved survival remains unclear.
  • This study evaluates LN thresholds for LN positivity and survival in a population-based colon cancer cohort.

Purpose of the Study:

  • To determine the optimal lymph node (LN) yield for accurate staging in colon cancer.
  • To identify LN yield thresholds associated with improved cancer-specific survival (CSS).
  • To evaluate the prognostic significance of LN yield in stages II and III colon cancer.

Main Methods:

  • Utilized a 25% random sample of stage II/III colon cancer patients from the Ontario Cancer Registry (2002-2008).
  • Employed multivariable regression to identify factors associated with LN positivity.
  • Applied Cox models and sequential regression analysis to determine LN thresholds for CSS.

Main Results:

  • Greater LN yield was associated with increased likelihood of LN positivity, with diminishing returns beyond 12-14 LNs.
  • Lower LN yield significantly increased cancer-specific mortality risk in stage II disease (HR 1.55-1.74), with no survival benefit beyond 20 LNs.
  • Lower LN yield also increased CSS risk in stage III disease (HR 1.49-2.20), with no specific survival threshold identified.

Conclusions:

  • Optimal LN evaluation for colon cancer shows incongruity between staging and survival metrics.
  • A threshold of 12 LNs may suffice for accurate staging.
  • Higher LN yields, potentially exceeding 20 LNs, are linked to improved survival outcomes.