Abstract

Abstract Context.—The protein p16Ink4a is overexpressed in cervical lesions associated with high-risk human papillomavirus (HPV) subtypes 16 and 18, but not in low-risk HPV subtypes 6 and 11 or non–HPV-associated cervical lesions. Objective.—To determine whether p16Ink4a expression in equivocal cervical lesions helps distinguish atypical non-HPV changes from HPV-related changes. Design.—One hundred ninety-one cervical lesions, including 81 cervical intraepithelial neoplasia 1, 52 squamous metaplasia, 33 cellular features suggestive of HPV-related change, 9 reserve cell hyperplasia, 4 microglandular hyperplasia, and 12 inflammatory cervicitis, were randomly selected from archival cervical biopsy specimens. All 191 samples were studied with p16Ink4a (JC8 monoclonal antibody). Reactivity for p16Ink4a was scored on a 3-tier system as follows: negative, 0% to 5% cells reactive; focal/scattered positive, greater than 5% and less than or equal to 80% cells reactive; diffuse positive, greater than 80% cells react...

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