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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Related Experiment Video

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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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Consistency of Radiological Staging in Resectable Mismatch-Repair Proficient Colon Cancer: An Interobserver Agreement

Vincenzo Nasca1, Gabriele Tinè2, Marta Vaiani3

  • 1Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.

Clinical Colorectal Cancer
|March 12, 2026
PubMed
Summary
This summary is machine-generated.

Radiological classification of colon cancer (CC) using CT scans showed inadequate agreement among radiologists for T and N staging. Improved CT criteria are needed for selecting patients for neoadjuvant therapy.

Keywords:
Clinical stagingLocalized colon cancerMicrosatellite stableMultidisciplinary evaluationNeoadjuvant treatment

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Area of Science:

  • Oncology
  • Radiology
  • Medical Imaging

Background:

  • Accurate CT imaging classification is vital for selecting resectable, nonmetastatic colon cancer (CC) patients for neoadjuvant therapy.
  • Standardized criteria are needed to improve the reproducibility of CT-based tumor staging in colon cancer.

Purpose of the Study:

  • To evaluate interobserver agreement among radiologists in classifying resectable, nonmetastatic colon cancer using CT scans.
  • To assess the concordance of CT-based T and N staging with pathological findings.
  • To determine the diagnostic performance of CT imaging for identifying high-risk features.

Main Methods:

  • Four independent radiology teams evaluated preoperative CT scans of 109 colon cancer patients.
  • Tumors were classified using FOxTROT and Node-RADS criteria for T and N staging, including extramural invasion (EMI).
  • Interobserver agreement (Cohen's κw), concordance with pathology, and diagnostic metrics were analyzed.

Main Results:

  • Inadequate interobserver agreement was observed for both clinical T (κw = 0.56) and N staging (κw = 0.51).
  • Concordance between CT-based and pathological staging was inadequate for T (κw = 0.47) and N (κw = 0.16).
  • CT sensitivity and specificity for pT3/T4 and pT4 were 72%/78% and 33%/93%, respectively.

Conclusions:

  • Current CT-based radiological classification for colon cancer exhibits significant interobserver variability.
  • Improved CT imaging criteria are necessary for accurate risk stratification and patient selection for neoadjuvant therapies.
  • Standardization of CT interpretation is crucial for optimizing treatment decisions in colon cancer management.