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Increased Expression of Oncogene-induced Senescence Markers During Cervical Squamous Cell Cancer Development

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Specialty Pathology
Date 2015 Feb 13
PMID 25674264
Citations 5
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Abstract

Purpose: To investigate the expression of p15(INK4b), p16(INK4a) and p21(Waf1/Cip1) in specimens from cases of normal cervical epithelium (NCE), cervical intraepithelial neoplasia (CIN) and squamous cell carcinoma (SCC), and to evaluate whether there is evidence implicating oncogene-induced senescence (OIS) in cervical squamous cell cancer development.

Methods: The immunohistochemical expression of p15(INK4b), p16(INK4a) and p21(Waf1/Cip1) were investigated in formalin-fixed paraffin-embedded specimens from 19 NCE, 51 CIN and 21 SCC cases, respectively. Comparisons among different groups for each marker were performed with Chi-square test.

Results: The expression of p15(INK4b), p16(INK4a) and p21(Waf1/Cip1) were significantly higher in both CIN and SCC compared to NCE. Furthermore, the expression of p15(INK4b) and p21(Waf1/Cip1) was significantly higher in CIN П compared to CIN І, and these expressions were statistically higher in CIN Ш compared to CIN П, respectively. The p16(INK4a) expression was significantly higher in CIN Ш compared to CIN І.

Conclusions: The results suggested that the senescence programs mediated by p15(INK4b), p16(INK4a) and p21(Waf1/Cip1) were activated during the stage of CIN and SCC, and demonstrated that senescence may play important role in preventing from NCE to SCC.

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