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Improved abnormal Pap smear triage using cervical cancer biomarkers
Jeffrey L Killeen1, Timothy Dye, Chelestes Grace
1Kapi'olani Medical Center for Women and Children, Honolulu, HI.
Journal of Lower Genital Tract Disease
|June 14, 2013
Summary
A dual stain for p16 and Ki-67 improves the triage of abnormal Pap smears, showing higher specificity than high-risk human papillomavirus (HPV) testing. This biomarker approach offers significant healthcare cost savings while effectively detecting cervical cancer precursors.
Area of Science:
- Gynecologic oncology
- Cervical cancer screening
- Biomarker diagnostics
Background:
- Current Pap smear screening and high-risk human papillomavirus (HPV) triage have limitations in specificity for detecting cervical cancer precursors.
- There is a need for more specific biomarkers to improve the triage of abnormal Pap smears.
Purpose of the Study:
- To evaluate the efficacy of a dual p16/Ki-67 immunostaining as a triage tool for abnormal Pap smears.
- To compare the diagnostic accuracy and cost-effectiveness of p16/Ki-67 immunostaining versus high-risk HPV testing.
Main Methods:
- p16/Ki-67 immunostaining was performed on slides from 515 women with abnormal Pap smears.
- High-risk HPV typing was conducted on all cases.
- Diagnostic accuracy for detecting cervical intraepithelial neoplasia (CIN) 2/3 and cost analysis were compared between the two methods.
Main Results:
- p16/Ki-67 immunostaining demonstrated higher specificity (60.92%) compared to high-risk HPV (14.94%) for detecting CIN 2/3.
- The diagnostic accuracy of p16/Ki-67 was significantly higher than hr-HPV.
- Immunostain triage could potentially save approximately $46,000 in the study population compared to HPV triage.
Conclusions:
- p16/Ki-67 immunostaining offers comparable sensitivity, improved specificity, and superior diagnostic performance for triaging abnormal Pap smears compared to hr-HPV.
- Biomarker triage using p16/Ki-67 is valuable for ASCUS, LSIL, and ASC-H Pap smears.
- Widespread adoption of biomarker triage can lead to significant healthcare cost savings without compromising the detection of cervical cancer precursors.
