Cervical carcinoma DNA content, S-fraction, and malignancy grading. I. Interrelationships.

Area of Science:

• Oncology
• Cell Biology
• Gynecologic Pathology

Background:

• Cervical cancer prognosis is influenced by tumor biology.
• DNA content and cell-cycle S-phase fraction are key indicators of tumor proliferation.
• Histopathologic grading assesses tumor malignancy but may not fully capture biological behavior.

Purpose of the Study:

• To investigate the relationship between DNA index, S-phase fraction (%S), and histopathologic malignancy grade in uterine cervical squamous cell carcinomas.
• To determine if combining these parameters improves the identification of biologically distinct cervical cancers.

Main Methods:

• Flow cytometry was used to measure DNA index and S-phase fraction (%S) from pre-radiotherapy tumor biopsies of 90 cervical cancers.
• Histopathologic malignancy grading was performed on the same biopsies.
• Statistical analyses were conducted to assess correlations between DNA index, %S, and malignancy grades.

Main Results:

• DNA aneuploidy frequency increased significantly with higher S-phase fractions (31% for low %S, 73% for intermediate %S, 97% for high %S).
• S-phase fraction significantly increased with increasing DNA aneuploidy degree (P < 0.01).
• Malignancy grades showed heterogeneity within DNA index and %S subgroups, but high S-fraction was associated with higher malignancy grade.

Conclusions:

• Tumor DNA index and cell-cycle S-phase fraction are important prognostic indicators in cervical cancer.
• Histopathologic malignancy grading reflects tumor proliferative activity more closely than DNA index alone.
• Evaluating DNA index in conjunction with cell-cycle %S and malignancy grading offers a more reliable method for identifying biologically diverse cervical cancers.