Liquid-Based Cytology in Cervical Cancer Screening: A Systematic Review and Meta-Analysis

Area of Science:

• Gynecologic Oncology
• Cytopathology
• Diagnostic Accuracy Studies

Background:

• Conventional Papanicolaou (Pap) smear is the standard for cervical cancer (CC) screening but has limitations.
• Liquid-based cytology (LBC) was developed to improve sample quality and standardization.
• Comparative diagnostic accuracy of LBC versus conventional Pap cytology requires rigorous assessment.

Purpose of the Study:

• To systematically assess the diagnostic accuracy of LBC compared to conventional Pap cytology for detecting cervical precancerous and cancerous lesions.
• To evaluate LBC's effectiveness in reducing unsatisfactory samples and improving detection rates of specific abnormalities.

Main Methods:

• Systematic review and meta-analysis of comparative studies.
• Searched PubMed and Cochrane Library for studies on LBC vs. conventional Pap cytology in CC screening.
• Analyzed outcomes including unsatisfactory sample rate, detection rates for CIN2+, squamous cell carcinoma (SCC), and glandular abnormalities using random-effects models.

Main Results:

• LBC significantly reduced unsatisfactory sample rates (RR 0.63).
• LBC demonstrated a 35% higher abnormal cytology detection rate (ADR) and 27% higher detection of CIN2+ lesions (RR 1.35 and RR 1.27, respectively).
• SCC detection rates were similar; however, LBC showed superiority in detecting glandular abnormalities with FDA-approved tests (RR 1.52).

Conclusions:

• LBC enhances the detection rates of CIN2+ lesions and histology-confirmed abnormalities while decreasing unsatisfactory samples.
• LBC supports improved cervical cancer screening, particularly with FDA-approved tests for glandular abnormality detection.
• Further research is recommended on LBC's cost-effectiveness in resource-limited settings.