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Related Experiment Video

Updated: May 17, 2026

Comparison of Predictive Performance of Three Lymph Node Staging Systems in Colorectal Signet Ring Cell Carcinoma Based on Machine Learning Model
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Predicting lymph node metastases in early rectal cancer.

Deborah Saraste1, Ulf Gunnarsson, Martin Janson

  • 1Division of Surgery, CLINTEC, and Department of Surgical Gastroenterology, Karolinska University Hospital, Huddinge, Sweden. deborah.saraste@karolinska.se

European Journal of Cancer (Oxford, England : 1990)
|November 6, 2012
PubMed
Summary

Identifying risk factors for lymph node metastases in early rectal cancer is crucial. A risk stratification index helps pre-operative planning for T1 and T2 rectal cancers, guiding treatment decisions.

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Area of Science:

  • Oncology
  • Surgical Oncology
  • Cancer Research

Background:

  • Lymph node metastases are a critical prognostic factor in rectal cancer.
  • Accurate pre-operative risk assessment is essential for optimal treatment planning in early-stage rectal cancers (T1 and T2).

Purpose of the Study:

  • To identify significant risk factors for lymph node metastases in T1 and T2 rectal cancers.
  • To develop a risk stratification index for pre-operative planning in these early-stage rectal cancers.

Main Methods:

  • Analysis of prospectively collected data from The Swedish Rectal Cancer Register (2007-2010).
  • Inclusion of T1 and T2 rectal cancers treated with abdominal resection without neoadjuvant or adjuvant therapy.
  • Evaluation of T-stage, sm-level, differentiation, tumor type, vascular/perineural invasion, location, age, and gender using logistic regression.

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Last Updated: May 17, 2026

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Main Results:

  • T2-stage, poor differentiation, and vascular infiltration were significant predictors of lymph node metastases (ORs 2.0, 6.5, and 4.3, respectively).
  • A risk stratification index demonstrated a progressive increase in metastasis risk from 6% to 65% for T1 and 11% to 78% for T2 cancers as risk factors accumulated.

Conclusions:

  • Significant variation in lymph node metastasis risk exists between low-risk T1 and high-risk T2 rectal cancers.
  • A risk stratification model can guide treatment, potentially utilizing local excision as an initial step with readiness for immediate radical resection in high-risk cases to balance oncologic outcomes and patient benefits.