DNA cytometry in postirradiation cervical-vaginal smears

Area of Science:

• Cytopathology
• Oncology
• Genetics

Background:

• Distinguishing benign radiation changes (BRC) from postirradiation dysplasia (PRD) or recurrent cervical cancer in cervical-vaginal smears is clinically challenging.
• DNA analysis offers a potential tool for improved diagnostic accuracy in postirradiation smears.

Purpose of the Study:

• To evaluate the utility of DNA content analysis in differentiating benign radiation changes from postirradiation dysplasia and recurrent cervical carcinoma in cervical-vaginal smears.

Main Methods:

• Retrospective analysis of 71 patients' cervical-vaginal smears.
• Feulgen staining followed by DNA content analysis of 100-250 cells using the CAS 200 image analysis system.
• Correlation of DNA histograms with clinical follow-up and diagnosis.

Main Results:

• Aneuploidy was detected in 91% of patients with recurrent cervical cancer, while rarely observed in smears with benign radiation changes.
• Benign radiation changes were associated with broad diploid peaks and increased proliferating cells.
• Abnormal DNA histograms were also observed in postirradiation dysplasia, indicating they do not always correlate with recurrent disease.

Conclusions:

• Interactive DNA cytometry is valuable for differentiating benign radiation changes from postirradiation dysplasia and recurrent cervical cancer.
• The presence of aneuploidy in DNA histograms is a strong indicator of recurrent cervical cancer.
• Careful interpretation of DNA histograms is necessary, as abnormal patterns can occur in benign conditions.