Comparison of the ScreenFire and Xpert HPV assays for the detection of human papillomavirus and cervical precancer among women living with HIV in Malawi

Chemtai Mungo; Anagha Guliam; Lameck Chinula; Federica Inturrisi; Lizzie Msowoya; Tawonga Mkochi; Siniya Jawadu; Silvia de Sanjosé; Mark Schiffman; Jennifer H Tang; Jennifer S Smith

doi:10.1186/s13027-024-00585-4

Comparison of the ScreenFire and Xpert HPV assays for the detection of human papillomavirus and cervical precancer among women living with HIV in Malawi

Infect Agent Cancer. 2024 May 17;19(1):24. doi: 10.1186/s13027-024-00585-4.

Authors

Chemtai Mungo¹, Anagha Guliam², Lameck Chinula^{3

4}, Federica Inturrisi⁵, Lizzie Msowoya⁴, Tawonga Mkochi⁴, Siniya Jawadu⁴, Silvia de Sanjosé^{5

6}, Mark Schiffman⁵, Jennifer H Tang^{3

4}, Jennifer S Smith⁷

Affiliations

¹ Department of Obstetrics and Gynecology, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA. chemtai_mungo@med.unc.edu.
² Barnard College of Columbia University, New York City, NY, USA.
³ Department of Obstetrics and Gynecology, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA.
⁴ University of North Carolina Project-Malawi, Lilongwe, Malawi.
⁵ Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA.
⁶ ISGlobal, Barcelona, Spain.
⁷ Gillings School of Global Public Health, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA.

Abstract

Background: The World Health Organization recommends human papillomavirus (HPV) testing for primary cervical cancer screening, including among women living with HIV (WLWH). Low-and-middle-income countries account for 85% of the cervical cancer burden globally, yet have limited access to HPV-based screening, largely due to cost. This study aims to compare the performance of a rapid, isothermal amplification HPV assay (ScreenFire) to that of the Xpert HPV assay for the detection of HPV and cervical precancer among WLWH in Malawi.

Methods: We utilized stored self- and provider-collected specimens from a prospective cohort study of WLWH in Malawi from July 2020 to February 2022. Specimens were tested with both Xpert and ScreenFire HPV assays. The overall and within-channel non-hierarchical agreement between ScreenFire and Xpert was determined for both self- and provider-collected specimens. Hierarchical ScreenFire HPV positivity by channel was compared to Xpert for each histological diagnosis-cervical intraepithelial neoplasia grade 2 or worse (CIN2+) compared to <CIN2.

Results: 315 matched self- and provider-collected specimens had valid results from both Xpert and ScreenFire testing and were included in analyses, of which 279 and 36 were HPV positive and HPV negative, respectively, on Xpert self-collection. Of the 315, 245 (78%) had normal pathology, 21 CIN1 (7%), 14 CIN2 (4%), and 35 CIN3 (11%). Of the 245 with normal pathology, 213 (87%) and 188 (77%) were HPV-positive on Xpert and ScreenFire self-collected specimens, respectively. Among provider-collected specimens, the assays had 80% agreement on overall HPV positivity (unweighted kappa 0.59, 95% 0.50-0.69). ScreenFire was HPV-positive in 90% of self-collected specimens that were HPV-positive on Xpert. Channel agreement between the assays was high for both self- and provider-collected specimens, but slightly lower for HPV18/45. In hierarchical analysis, ScreenFire demonstrated high concordance with Xpert testing for detecting CIN2+ cases in all channels, missing no HPV 16 or HPV 18/45 positive CIN2+ case that was positive on Xpert, in both self- and provider-collected specimens.

Conclusion: In this study of stored specimens, the ScreenFire HPV assay performed well in the detection of HPV and CIN2+ among WLWH compared to the Xpert HPV assay. If supported by larger validation studies, ScreenFire could be an affordable alternative point-of-care HPV assay for use in LMICs.

Abstract

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