Triage of women with equivocal or low-grade cervical cytology results: a meta-analysis of the HPV test positivity rate

Marc Arbyn, Pierre Martin-Hirsch, Frank Buntinx, Marc Van Ranst, Evangelos Paraskevaidis, Joakim Dillner, Marc Arbyn, Pierre Martin-Hirsch, Frank Buntinx, Marc Van Ranst, Evangelos Paraskevaidis, Joakim Dillner

Abstract

Consistent evidence underlines the utility of human papillomavirus (HPV) DNA testing in the management of women with equivocal cervical cytological abnormalities, but not in case of low-grade lesions. We performed a meta-analysis including studies where the high-risk probe of the Hybrid Capture-II is used to triage these two cytological categories. The triage test-positivity rate reflects the colposcopy referral workload.Data were pooled on the HPV test positivity rate in women with atypical squamous cells of undetermined significance (ASCUS/ASC-US) or low-grade squamous intraepithelial lesions (LSIL), derived from different cytological classification systems. The meta-analysis was restricted to studies, published between 1991 and 2007. A random-effect model was applied for meta-analytical pooling and the influence of covariates on the HPV positivity rate was analyzed by meta-regression. The variation by age was assessed within individual studies since age strata were not defined uniformly. On an average, 43% (95% CI: 40-46%) of women with ASCUS/ASC-US were high-risk HPV positive (range 23-74%). In women with LSIL, the pooled positivity rate was 76% (95% CI: 71-81%; range 55-89%). In spite of considerable inter-study heterogeneity, the difference in HPV positivity between the two triage groups was large and highly significant: 32% (95% CI: 27-38%). HPV rates dropped tremendously as age and cutoffs of test positivity increased. Other factors (cytological classification system, country, continent, collection method and year of publication) had no statistically significant impact, except in LSIL triage where HPV positivity was significantly lower in European compared to American studies. Women with LSIL, especially younger women, have high HPV positivity rates suggesting limited utility of reflex HPV triaging these cases. Research is needed to identify more specific methods to triage women with low-grade squamous cervical lesions.

Figures

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1
Meta-analysis of the proportion of women with ASCUS or a borderline Pap smear that have a positive Hybrid Capture II test.
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2
Meta-analysis of the proportion of women with LSIL or a mildly dyskaryotic Pap smear that have a positive Hybrid Capture II test.
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3
Difference in Hybrid Capture 2 test-positivity rate between LSIL/mild dyskaryosis and ASCUS/borderline dyskaryosis cases.
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4
ROC curve representing the true positivity rate (TPR = sensitivity) for CIN3 or worse disease as a function of the false-positivity rate (FPR = 1-specificity) for increasingly sensitive combinations of HPV genotypes. The plot is constructed using data received from the ASCUS-LSIL triage study, and concerns the accuracy of an HPV multi-typing assay applied on women with ASCUS [82]. The square in the upper right corner corresponds with the sensitivity and specificity for CIN3+ of the Hybrid Capture II assay [8].

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