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Three-dimensional confocal laser scanning DNA ploidy cytometry in thick histological sections
P Tekola1, J P Baak, H A van Ginkel
1Department of Pathology, Free University, Amsterdam, The Netherlands.
The Journal of Pathology
|October 1, 1996
Summary
A new 3D image cytometry (3DICM) method accurately measures DNA ploidy in thick histological sections. This technique offers a reproducible and clinically feasible approach for analyzing DNA content in tumors, especially for small lesions.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Pathology
Background:
- DNA ploidy analysis of solid tumors using flow cytometry (FCM) or image cytometry (ICM) on single cell suspensions has prognostic value.
- Standard ICM faces limitations with histological sections due to nuclear capping or overlap.
- Three-dimensional (3D) microscopy, like confocal laser scanning microscopy (CLSM), has potential but yielded unsatisfactory results previously.
Purpose of the Study:
- To develop and validate a novel 3D image cytometry (3DICM) method for accurate DNA ploidy assessment in thick histological sections.
- To evaluate the performance of 3DICM using YOYO-1 iodide stained nuclei across various ploidy levels (haploid to octaploid).
- To compare 3DICM results with traditional FCM and ICM for a near-triploid breast cancer sample.
Main Methods:
- A new 3D image cytometry (3DICM) method was developed to measure DNA content in 20-micron thick histological sections.
- Nuclei (haploid, diploid, tetraploid, octaploid, near-triploid) were stained with YOYO-1 iodide, a sensitive and stable fluorescent DNA dye.
- The 3DICM method was applied to human and rat tissues, including a breast cancer sample, and compared with FCM/ICM.
Main Results:
- Integrated 3DICM fluorescence intensity showed excellent linearity (r = 0.99) with actual DNA content.
- Low coefficients of variation (CV) were achieved for various ploidy distributions in human and rat tissues (e.g., 4.0% for tetraploid, 1.6% for rat octaploid).
- Repeated blind measurements demonstrated excellent reproducibility between observers (r = 0.98).
Conclusions:
- The developed 3D image cytometry (3DICM) method is accurate, reproducible, and clinically feasible for DNA ploidy analysis in thick histological sections.
- This method overcomes limitations of standard ICM and is particularly valuable for small lesions or when FCM/ICM results are inadequate.
- 3DICM offers a promising advancement for prognostic assessment in solid tumors using histological samples.