Background/Objective: High-risk human papillomavirus (hrHPV) is an established causative agent for the malignant transformation of cervical cells that can be detected using the Papanicolaou (Pap) smear test. A call by the World Health Organization (WHO) for global collective efforts towards eliminating cervical cancer has endorsed hrHPV DNA testing as an alternative screening test. The objective of this study was to determine the diagnostic utility of hrHPV DNA testing in detecting high-grade cervical intraepithelial lesions (HSILs) in unvaccinated women with abnormal Pap smears and histopathologically confirmed CIN3 and carcinoma.

Methods: This study included 111 cervical tissues with a histopathological confirmation of the cervical intraepithelial neoplasia grade (CIN3) and malignancy. Tissues were sectioned, dewaxed, and digested, and DNA was extracted and tested for hrHPV using the Abbott RealTime HR HPV assay. Pap smear results associated with the tissue samples were extracted from corresponding clinical records, and data was analyzed using R-statistical software.

Results: Extracted Pap smear records for the 111 cervical tissue samples indicated that 89 (80.2%) had a high-grade intraepithelial lesion (Pap-HSIL), 20 (18%) had squamous cell carcinoma (Pap-SCC), and two (1.8%) had Pap-adenocarcinoma. A total of 68/89 (76.4%) of Pap-HSIL, 15/20 (75%) of Pap-SCC, and ½ (50%) of Pap-adenocarcinoma cases had detectable hrHPV DNA.

Conclusions: This study’s findings demonstrate that the Pap smear is still a valuable screening test especially for detecting both hrHPV-dependent and -independent cervical dysplasia in unvaccinated populations. While considerations are made to improve cervical cancer screening, including the introduction of hrHPV DNA testing in national cervical cancer screening programs, there is a need for the careful interpretation of molecular testing results for clinical intervention. This is especially important for hrHPV-independent cervical dysplasia screening, since this can have dire implications for clinically asymptomatic women.

Keywords: pap smear HPV; cervical cancer

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