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Multicenter direct to vial evaluation of a liquid-based pap test
Kenneth D Hatch1, Ellen Sheets, Alex Kennedy
1The Department of Obstetrics and Gynecology, University of Arizona Health Sciences Center, Tucson, AZ, USA. khatch@u.arizona.edu
Journal of Lower Genital Tract Disease
|May 6, 2005
Summary
The ThinPrep (TP) pap test significantly improved cervical precancer detection compared to the conventional Pap (CP) test. TP increased detection of high-grade lesions by 59.7%, confirming improved diagnostic accuracy.
Area of Science:
- Gynecology
- Cytopathology
- Cervical Cancer Screening
Background:
- Cervical cancer screening relies on accurate cytologic methods.
- Conventional Pap (CP) smears have limitations in sensitivity.
- Advancements in sample preparation aim to improve diagnostic yield.
Purpose of the Study:
- To compare the efficacy of fluid-based, thin-layer (TP) preparation versus conventional Pap (CP) testing.
- To assess the detection rates of precancerous cervical lesions confirmed by biopsy.
Main Methods:
- A prospective study screened 10,226 patients using the TP method.
- Results were compared to a historical control group of 20,918 patients who underwent CP screening.
- Both groups had similar patient populations and profiles.
Main Results:
- The TP method significantly increased the detection rate of high-grade squamous intraepithelial lesions (HSIL+) by 59.7% compared to CP (3.9% vs. 2.4%, p < .001).
- TP also showed a significant increase in detecting low-grade squamous intraepithelial lesions (p < .01).
- Detection rates for cancer and atypical cells were similar between TP and CP.
Conclusions:
- The TP method significantly enhances the cytologic detection of HSIL and low-grade squamous intraepithelial lesions.
- Histologic confirmation supports increased detection, not false-positive interpretations.
- Fluid-based thin-layer preparation offers superior performance in cervical precancer screening.