Liquid-Based Cervical Cytology: Monitoring the Laboratory Quality Indicators

Area of Science:

• Gynecologic Pathology
• Cytopathology
• Oncology

Background:

• Cervical cancer screening has evolved significantly, with cytology being a key diagnostic tool.
• Liquid-based cytology (LBC) offers improvements in sample preparation and preservation.
• Despite advancements, cytology's sensitivity in detecting cervical cancer precursors remains a challenge.

Purpose of the Study:

• To assess the frequency of abnormal findings in liquid-based cervical cytology (LBC) at a specific center.
• To correlate abnormal LBC results with histological diagnoses.
• To evaluate the association between abnormal LBC results and human papillomavirus (HPV) DNA test outcomes.

Main Methods:

• A retrospective analysis of 4286 LBC screening cases over five years.
• Correlation of cytology results with cervical biopsy histology using a two-tier grading system.
• Analysis of human papillomavirus (HPV) DNA test results where available.

Main Results:

• 5% of LBC cases showed epithelial cell abnormalities, including atypical squamous cells (ASC-US, ASC-H), low-grade squamous intraepithelial lesion (LSIL), high-grade squamous intraepithelial lesion (HSIL), and atypical glandular cells.
• The positive predictive value (PPV) for HSIL on cytology correlating with biopsy was 94.4%.
• Of the abnormal cytology cases, 24 were positive for high-risk HPV (hrHPV), and HPV was detected in 50 of 2737 tested samples.

Conclusions:

• The study successfully analyzed quality control parameters for the cytopathology laboratory.
• Laboratory quality metrics were found to be within acceptable standards.
• The correlation between cytology, histology, and HPV testing provides valuable insights for cervical cancer screening protocols.