Abstract | OBJECTIVE: METHODS: We studied 66 ASCUS-categorized Pap smears with subsequent follow-up biopsies. HR-HPV viral load was determined by Hybrid Capture II assay from the cervical swab in each ASCUS-diagnosed Pap smear. Both smears and biopsies were immunostained with a primary anti-p16 antibody, clone E6H4, and we analyzed the correlations between HR-HPV viral load in each ASCUS-diagnosed Pap smear and p16 expression of smears with follow-up biopsies. RESULTS: Correlation analyses of the corresponding histological diagnoses from 66 ASCUS-diagnosed Pap smears revealed that 21 (32%) cases had only reactive changes and 45 cases showed cervical intraepithelial neoplasia including LSIL (24 cases, 36%) and HSIL or higher (21 cases, 32%). Tests for HR-HPV viral load revealed 17 (26%) negative cases and 49 (74%) positive cases. Immunostaining showed that 26 cases (39%) were negative and 40 (61%) were positive for p16 expression. Comparative analysis of these two tests indicated consistencies as well as discrepancies. They showed significant differences (P < 0.001) between negative p16 expressions of Pap smears with the presence of reactive lesions in follow-up biopsies and HR-HPV viral load. However, no significant difference (P = 0.739 and 0.606) between p16 expression of Pap smears with the presence of LSIL, HSIL or higher in follow-up biopsies and high HR-HPV viral load was found. In addition, there were significant differences (P < 0.001) in specificity and positive predictive value, but no significant differences were found in sensitivity (P = 0.606) and negative predictive value (P = 0.062) between p16 immunostaining and HR-HPV viral load. CONCLUSION: The results indicate that there is a close association between weak or strong p16 expressions in ASCUS-categorized smears with the presence of SILs in follow-up biopsies and positive HR-HPV viral loads. Conversely, there is also a clear association between the lack of p16 expression and the absence of significant lesions in follow-up biopsies, but this is not consistent with a negative HR-HPV viral load. It is concluded that p16 expression is an indicator of pathogenic activity of HR-HPV, which is an objective biomarker for clarification of ASCUS-categorized Pap smears in gynecological cytopathology. Furthermore, through comparative analysis, directly visualized p16 immunostaining on smears appears to be a more effective method than HR-HPV viral load for the detection of reactive changes and LSILs from ASCUS-categorized Pap smears.
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Authors | Shin Nieh, Su-Feng Chen, Tang-Yuan Chu, Hung-Cheng Lai, Yaoh-Shiang Lin, Earl Fu, Ching-Hwa Gau |
Journal | Gynecologic oncology
(Gynecol Oncol)
Vol. 97
Issue 1
Pg. 35-40
(Apr 2005)
ISSN: 0090-8258 [Print] United States |
PMID | 15790434
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Biomarkers, Tumor
- Cyclin-Dependent Kinase Inhibitor p16
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Topics |
- Biomarkers, Tumor
(biosynthesis)
- Biopsy
- Cervix Uteri
(metabolism, pathology, virology)
- Cyclin-Dependent Kinase Inhibitor p16
(biosynthesis)
- Epithelial Cells
(metabolism, pathology, virology)
- Female
- Follow-Up Studies
- Humans
- Papillomaviridae
- Papillomavirus Infections
(metabolism, virology)
- Tumor Virus Infections
(metabolism, virology)
- Uterine Cervical Neoplasms
(metabolism, pathology, virology)
- Viral Load
- Uterine Cervical Dysplasia
(metabolism, pathology, virology)
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