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Based on data from randomised controlled trials (RCT) on primary cervical screening, it has been reported that the problem of more frequent false-positive tests in Human Papillomavirus (HPV) DNA screening compared to cytology could be overcome. However, these reports predominantly operated with a narrow definition of a (false-)positive test. The aim of this paper was to illustrate how the narrow definition affected the measured adverse effects of HPV DNA screening compared with cytology screening.
In the European RCT data, we measured the impact of the narrow definition of a positive screening test on the published relative positive predictive values (PPV), an indicator of the relative frequency of false-positive screening tests.
Using the trialists' definitions of positive screening tests, HPV screening combined with cytology triage had relative PPVs of 0.87 (95% confidence interval (CI): 0.60-1.26) for ⩾CIN3 based on Swedish RCT data, and 0.78 (0.52-1.16) for ⩾CIN2 in the Italian Phase 1 RCT (25-34 years). These PPVs changed to 0.44 (0.30-0.64) and 0.51 (0.33-0.79), respectively, when all positive HPV or cytology screening tests were accounted for. In the Finnish RCT data, HPV screening using the cut-off point of ⩾10pg/ml had a relative PPV of 0.27 (0.15-0.50) for ⩾CIN3, which changed to 1.84 (0.99-3.41).
The relative PPV was incorrectly estimated in six out of seven studies. In three of those six studies, the relative PPV changed significantly after inclusion of the previously erroneously excluded false-positive HPV or cytology tests.
Department of Public Health, University of Copenhagen, Øster Farimagsgade 5, 1014 København K, Denmark.
This article was published in the following journal.
Name: European journal of cancer (Oxford, England : 1990)
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Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)
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The identification of selected parameters in newborn infants by various tests, examinations, or other procedures. Screening may be performed by clinical or laboratory measures. A screening test is designed to sort out healthy neonates (INFANT, NEWBORN) from those not well, but the screening test is not intended as a diagnostic device, rather instead as epidemiologic.
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A type of human papillomavirus especially associated with malignant tumors of the genital and RESPIRATORY MUCOSA.
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