1. Performance of BD Onclarity HPV assay on FLOQSwabs vaginal self-samples.
- Author
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Martinelli M, Latsuzbaia A, Bonde J, Pedersen H, Iacobone AD, Bottari F, Piana AF, Pietri R, Cocuzza CE, and Arbyn M
- Subjects
- Female, Humans, Early Detection of Cancer methods, Papillomaviridae, Uterine Cervical Neoplasms, Papillomavirus Infections diagnosis, Uterine Cervical Dysplasia pathology
- Abstract
This study assessed the accuracy of high-risk human papillomavirus testing of BD Onclarity HPV (Onclarity) assay on vaginal self-collected FLOQSwab versus cervical samples to ensure similar accuracy to detect cervical intraepithelial neoplasia. Testing was performed on two automated platforms, BD Viper LT and BD COR, to evaluate the effect of machine and using two vaginal self-samples to analyze the influence of collection, transport, and freezing-unfreezing on the results. A cervical sample and two self-samples were collected from 300 women. The first collected vaginal and the cervical sample were tested on BD Viper LT, and the second swab was frozen and subsequently tested on both automated systems. Test results on vaginal and cervical specimens were considered the index and comparator, respectively; colposcopy and histology were reference standards. Relative sensitivity for ≥CIN2 on vaginal samples analyzed versus the cervical sample was 1.01 (0.97-1.06), 1.01 (0.97-1.06), and 1.00 (0.95-1.05), for the first, second self-collected sample tested on BD VIPER LT, and second self-collected sample tested on BD COR, respectively. Relative specificity was 0.83 (0.73-0.94), 0.76 (0.67-0.87), and 0.82 (0.73-0.92) using the three different workflows. Cut-off optimization for human papillomavirus (HPV) positivity defined at Ct ≤38.3 for HPV16, ≤ 34.2 for HPV18, and ≤31.5 for all other types showed an increased relative specificity with similar sensitivity. No significant difference was observed between self-samples tested with the two platforms and between first- and second-collected swabs. Onclarity assay on FLOQSwab using both platforms showed similar sensitivity but lower specificity to detect ≥CIN2 compared to cervical samples. By cut-off optimization, non-inferior specificity could be reached., Importance: Human papillomavirus (HPV) testing on self-collected vaginal samples has been shown to improve women's participation to cervical cancer screening programs, particularly in regions with limited access to health care. Nevertheless, the introduction of self-sampling in cervical cancer screening programs requires prior clinical validation of the HPV assay in combination with a self-sample collection device, including also the laboratory workflow and automation required for high-throughput testing in screening. In this study, the performance of BD Onclarity HPV on FLOQSwab-collected vaginal self-samples has been compared to clinician-taken liquid-based cytology samples, to detect high-grade cervical intraepithelial neoplasia using two high-throughput platforms, BD Viper LT and BD COR. The study findings have shown a similar performance of BD Onclarity on testing self-collected samples, confirming the validation of the proposed pre-analytical and analytical protocols for their use in cervical cancer screening programs based on self-collected vaginal samples., Competing Interests: The Extended VALHUDES is a researcher-induced study designed by the University of Milano-Bicocca (Study Coordinating Centre, Monza, Italy), Sciensano (Statistical Study Report, Bruxelles, Belgium), IEO (Istituto Europeo di Oncologia, Milan, Italy), University of Sassari (Sassari, Italy), U.O. Coordinamento Consultori Familiari, ASSL Sassari - ATS Sardegna (Sassari, Italy) and Molecular Pathology Laboratory (MPL), Department of Pathology (Hvidovre Hospital, Denmark). Manufacturers of HPV assays and devices (BD Diagnostics, Sparks, MD, USA and Copan Italia Spa, Brescia, Italy) participated in the Extended VALHUDES framework contributing financial support and equipment for laboratory testing and statistical analysis under the condition of accepting independent publication of results. The study group received free vaginal self-sample collection devices from Copan Italia Spa (Brescia, Italy) and free BD Onclarity HPV assay from (BD Diagnostics, Sparks, MD, USA). J.B. has received honoraria for lectures or advisory board activity from Roche Molecular Systems, BD Diagnostics, and MSD. C.E.C. has received research support and/or honoraria from BD Diagnostics, Seegene, Arrows Diagnostics, Copan, GeneFirst and Hiantis. M.M., A.L., H.P., A.D.I., F.P., A.F.P., and R.P. declare no conflict of interest.
- Published
- 2024
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