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. 2007 Sep;131(9):1343-9.
doi: 10.1043/1543-2165(2007)131[1343:PAKIIA]2.0.CO;2.

p16 and Ki-67 Immunostaining in Atypical Immature Squamous Metaplasia of the Uterine Cervix: Correlation With Human Papillomavirus Detection

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p16 and Ki-67 Immunostaining in Atypical Immature Squamous Metaplasia of the Uterine Cervix: Correlation With Human Papillomavirus Detection

Lori Iaconis et al. Arch Pathol Lab Med. .

Erratum in

  • Arch Pathol Lab Med. 2008 Jan;132(1):13

Abstract

Context: Atypical immature squamous metaplasia (AIM) of the cervix is a loosely defined entity characterized by immature metaplastic cells with mild cytologic atypia.

Objective: To examine whether a combination of immunostaining for p16 and Ki-67 could be used to stratify AIM cases into 3 categories: benign, cases with nondiagnostic atypia, and high-grade squamous intraepithelial lesion (HSIL).

Design: The study consisted of 37 cases of AIM, 23 cases of benign cervical mucosa (NEG), and 36 cases of HSIL. All cases were tested for high-risk human papillomaviruses using SPF 10 polymerase chain reaction and immunostained for p16 and Ki-67.

Results: All cases of HSIL were positive for both p16 and Ki-67. All but 2 benign control cases were negative for both p16 and Ki-67. Seven cases of AIM (19%) displayed a pattern of immunostaining identical to HSIL, and these most likely represent a spectrum of HSIL. A total of 54% of cases of AIM were negative for both p16 and Ki-67, consistent with benign reactive atypia. Two AIM cases (5%) were negative for p16 and positive for Ki-67 in the area adjacent to an ulcer, representing regeneration. Finally, 22% of AIM cases were positive for p16 and negative for Ki-67; such cases may represent a precursor of HSIL or, alternatively, a regressing HSIL.

Conclusion: The combination of immunostaining for p16 and Ki-67 is helpful in limiting of the number of cases with nondiagnostic atypia of the cervix.

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