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Evaluation of Pre-Analytical variables for HPV Primary Screening from Self-Collected Vaginal Swabs.
Journal of Molecular Diagnostics : JMD 2024 March 16
HPV primary screening is an effective approach to assessing cervical cancer risk. Self-collected vaginal swabs have shown promise to expand testing access, but there are limited data defining analytical performance criteria necessary for adoption of self-collected specimens, especially for those occurring outside the clinic where the swab remains dry during transport. Here, we evaluated the performance of self-collected vaginal swabs for HPV detection using the Roche Cobas 6800. There was insignificant variability between swabs self-collected by the same individual (n=15 participants collecting 5 swabs/participant), measured by amplification of HPV and human β-globin control DNA. Comparison of self-collected vaginal swab and provider-collected cervical samples (n=144 paired collections) proved highly concordant for HPV detection (total agreement=90.3%;PPA=84.2%). There was no relationship between the number of dry storage days and amplification of HPV (n=68, range 4-41days). Exposure of self-collected dry swabs to extreme summer and winter temperatures did not affect testing outcomes. We assessed a second internal control (RNAseP) in a subset and demonstrate that lack of amplification for β-globin from self-collected specimens was consistent with poor, but not absent, cellularity. These data suggest that self-collected vaginal samples enable accurate clinical HPV testing, and that extended ambient dry storage or exposure to extreme temperatures do not influence HPV detection. Further, lack of β-globin amplification in HPV negative samples accurately identified participants that required recollection.
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