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Tissue sampling and histological grading in colorectal cancer. Are routine sections representative?
1Department of Pathology, Trondheim Regional and University Hospital, Norway.
Summary
Routine microscopical sections accurately represent colorectal adenocarcinoma histological grade. Including superficial and deep tumor parts in sections at least 2-3 cm allows reliable grading from one or two samples.
Area of Science:
- Oncology
- Pathology
- Gastroenterology
Background:
- Histological grading of colorectal adenocarcinomas is crucial for prognosis and treatment decisions.
- Routine diagnostic sections may not fully represent the entire tumor's heterogeneity.
Purpose of the Study:
- To assess the representativity of routine microscopical sections for determining the histological grade of colorectal adenocarcinomas.
- To establish criteria for accurate tumor grading using limited tissue samples.
Main Methods:
- Examination of microscopical sections from 50 colorectal adenocarcinomas.
- Point-counting of random tumor areas to estimate glandular differentiation.
- Comparison of overall tumor grade with grades from routine sections.
Main Results:
- Volumetric analysis revealed consistent differentiation patterns within tumors.
- Histological grade determined from routine sections correlated well with overall tumor grade.
- Inclusion of superficial and deep tumor sections, at least 2-3 cm, ensured accuracy.
Conclusions:
- One or two routine sections, if properly selected, can provide sufficient accuracy for grading colorectal adenocarcinomas.
- This finding supports the efficiency of current diagnostic practices for tumor grading.