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Endometrial cytopathology. An image analysis approach using the Ki-67 biomarker
G Apostolou1, N Apostolou2, P Moulos3
1Department of Cytopathology, Anti-cancer Oncological Hospital St. Savvas, Athens, Greece.
Insights
Endometrial epithelial and adenocarcinoma cells show distinct biological behaviors, differing in nuclear size and Ki-67 expression pathways. These differences may stem from varying stem cell states, impacting disease progression.
Area of Science:
- Gynecologic pathology
- Cell biology
- Cancer research
Background:
- Endometrial adenocarcinoma exhibits varying grades and behaviors.
- Understanding the cellular differences between benign and malignant endometrial cells is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the distinct cellular identity and biological behavior of benign endometrial epithelial cells versus endometrial adenocarcinoma cells.
- To compare these characteristics across different grades of endometrial cancer.
Main Methods:
- Image analysis and Ki-67 biomarker assessment of endometrial imprint smears.
- Examination of three groups: benign hyperplastic endometrium, low-grade endometrial adenocarcinoma, and high-grade endometrial adenocarcinoma.
- Application of the plastic stem cell model.
Main Results:
- Statistically significant differences in the nuclear area major axis of Ki-67 positive cells were observed between endometrial epithelial and adenocarcinoma cells (P<.0001).
- High-grade adenocarcinomas showed higher cycling nuclear area major axis values compared to low-grade adenocarcinomas and benign endometrium (P<.0001).
- Benign lesions displayed a Ki-67 increase pathway, while adenocarcinomas exhibited a relatively stable Ki-67 pathway.
Conclusions:
- Differences in nuclear dimensions correlate with the specific identity and biological behavior of endometrial epithelial and adenocarcinoma cells.
- Distinct Ki-67 pathways (increasing in benign, stable in malignant) suggest different cellular proliferation strategies.
- Variations in stem cell states may underlie the differing biology of these endometrial cell categories.
Objective:
To investigate the different identity and biological behaviour of endometrial benign epithelial and endometrial adenocarcinoma cell categories.
Methods:
For this study, the imprint smears from three groups, 10 cases of disordered proliferative/benign hyperplastic endometrium, 21 cases of low-grade and eight cases of high-grade endometrial adenocarcinoma, were examined using image analysis and the Ki-67 biomarker. The plastic stem cell model was also applied.
Results:
Among the examined groups, the nuclear area major axis ranged statistically different in the digitally measured Ki-67 positive endometrial epithelial and adenocarcinoma cells (P<.0001). Moreover, higher values of the cycling nuclear area major axis were observed in high-grade, as compared with the low-grade endometrial adenocarcinomas (P<.0001) and the cases of disordered/benign hyperplastic endometrium (P<.0001). Additionally, a Ki-67 increase pathway was observed in the benign endometrial lesions, and a relatively stable pathway was noticed in low- and high-grade endometrial adenocarcinomas.
Conclusions:
The different range of the nuclear area major axis among cycling endometrial epithelial and adenocarcinoma cells may correlate with their specific identity and biological behaviour. The different values of the cycling nuclear area major dimension may also be connected with the biological behaviour of the three examined groups. Moreover, the endometrial epithelial cells may follow a Ki-67 increase pathway, instead of the relatively stable pathway which the rapidly proliferating adenocarcinoma cells may use. Finally, the studied cell categories may exhibit different biology, because their stem cells may reside in different states of stemness.
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