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Clinical evaluation of human papillomavirus 16/18 oncoprotein test for cervical cancer screening and HPV positive women triage.
HPV-16 and -18 account for about 80% of cervical cancers. We evaluated the performance of HPV-16/18 oncoprotein to predict precancer and cancer in corresponding tissue biopsy specimens. 1,008 women attending cervical cancer screening program and 638 women referred to colposcopy with biopsy-confirmed cervical intraepithelial neoplasia grade 2 or worse (CIN2+) from 4 hospitals were recruited (1,646 in total). All women were tested OncoE6 (AVC), Liquid-Based Cytology (Hologic) and cobas HPV test (Roche). Colposcopy was performed on women with any abnormal results. The final diagnoses were based on a consensus panel review of the histology. There were 919 normal, 69 CIN1, 53 CIN2, 91 CIN3,474 squamous cell carcinoma(SCC) and 40 adenocarcinoma (ADC) cases, the prevalence of OncoE6 was 1.7%, 10.1%, 13.2%, 44.0%, 80.4% and 65.0%, respectively. The percent positive for cobas was higher than that of OncoE6 in detection of HPV16/18 in entire population (p < 0.001). However, the disparity of positive rate between these two tests became tiny among cervical cancer patients (CIN2: 26.4% vs. 13.2%, CIN3: 73.6% vs. 44.0%, SCC: 84.0% vs. 80.4%, ADC: 67.5% vs. 65.0%). OncoE6 was less sensitive than cobas (73.9% vs. 93.6%, p < 0.001), but more specific (97.1% vs. 75.4%, p < 0.001) for CIN3+ in entire population; OncoE6 yielded a sensitivity of 77.7% and a specificity of 91.0% for CIN3+ among cobas positive women, which can reduce nearly half of the colposcopy referral numbers. OncoE6 can be considered as a useful tool for cervical cancer screening and a potential powerful biomarker for HPV positive triage.
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