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Am J Obstet Gynecol. 2009 Nov;201(5):488.e1-7. doi: 10.1016/j.ajog.2009.05.046. Epub 2009 Aug 15.

Value of p16(INK4a) as a marker of progression/regression in cervical intraepithelial neoplasia grade 1.

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Department of Obstetrics and Gynecology, Hospital Clínic, University of Barcelona Faculty of Medicine, Barcelona, Spain.



The objective of this study was to evaluate the usefulness of p16(INK4a) staining to classify cervical intraepithelial neoplasia grade 1 according to its progression/regression risk.


Patients with a histologic diagnosis of cervical intraepithelial neoplasia grade 1 were prospectively recruited (n = 138). Simultaneous detection of high-risk human papillomaviruses and p16(INK4a) evaluation were performed. Follow-up was conducted every 6 months by cytology and colposcopy and annually by high-risk human papillomavirus testing, for at least 12 months (mean, 29.0). Progression was defined as a histologic diagnosis of cervical intraepithelial neoplasia grades 2-3, regression as a negative cytology and high-risk human papillomaviruses, and persistence as a cytologic result of low-grade squamous intraepithelial lesions and/or a positive test for high-risk human papillomaviruses.


Progression was observed in 14 women (10.1%), 66 (47.6%) regressed, and 58 (42.0%) had a persistent disease. p16(INK4a) was positive in 77 (55.8%) initial biopsy specimens. Progression to cervical intraepithelial neoplasia grades 2-3 was identified in 14 of 77 (18.2%) women with positive and none of 61 (0.00%) women with negative p16(INK4a) immunostaining (P < .001).


p16(INK4a) negative cervical intraepithelial neoplasia grade 1 lesions rarely progress and may benefit from a less intensive follow-up.

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