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Differential Expression of p16(INK4A) and Cyclin D1 in Benign and Malignant Salivary Gland Tumors: A Study of 44 Cases.
MedLine Citation:
PMID:  23315417     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Salivary gland tumors (SGT) are a heterogeneous group of lesions. There is conflicting data concerning the molecular events involving the tumour suppressor retinoblastoma protein (pRb) pathway in these tumors. Few studies examined the alterations in components of the Rb pathway by immunohistochemical (IHC) methods in benign and malignant SGTs. Furthermore, recent evidence implicates human papillomavirus (HPV) in mucoepidermoid carcinoma (MEC) carcinogenesis. The purpose of our study is to examine p16(INK4A) and cyclin D1 expression in a variety of benign and malignant salivary gland tumors, and to investigate p16(INK4A) expression as a surrogate marker for HPV infection in MEC. Our series includes 30 malignant tumors [14 MEC, 6 acinic cell carcinomas (ACC), 5 polymorphous low grade adenocarcinomas (PLGA), 5 (AdCC)] and 14 benign tumors (4 benign cysts, 5 Warthin tumors and 5 pleomorphic adenomas (PA). All cases were tested by IHC for p16(INK4A) and cyclin D1. Testing for HPV wide spectrum (HPV-WS) was performed by in situ hybridization in all MEC cases. Staining intensity was recorded semi quantitatively (on a scale from 0 to 4+). Fisher's exact test and Pearson X(2) test with a p < 0.05 were used. Cyclin D1 and p16(INK4A) are expressed similarly in malignant and benign tumors (p = 0.146 and p = 0.543, respectively). None of the MEC cases showed nuclear reactivity for HPV-WS. Statistical analysis showed positive correlation between cyclin D1 and p16(INK4A) expression. Our findings suggest that p16(INK4A) overexpression is likely secondary to cyclin D1 gene upregulation or amplification. Further molecular studies are warranted.
Authors:
G Jour; K West; V Ghali; D Shank; G Ephrem; B M Wenig
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-13
Journal Detail:
Title:  Head and neck pathology     Volume:  -     ISSN:  1936-0568     ISO Abbreviation:  Head Neck Pathol     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101304010     Medline TA:  Head Neck Pathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Pathology and Laboratory Medicine, Beth Israel Medical Center, Albert Einstein College of Medicine, New York, NY, USA.
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