Abstract:
BACKGROUND:We investigated p16(INK4A) expression in branchial cleft cysts and its utility in distinguishing branchial cleft cysts from metastatic head and neck squamous cell carcinomas (SCCs) in fine-needle aspiration biopsies (FNABs). METHODS:A study set comprising 41 resections (15 SCC and 26 branchial cleft cysts) and a test set of 15 FNABs (11 SCC and 4 branchial cleft cysts) were analyzed with p16(INK4A) immunohistochemistry and human papillomavirus (HPV) polymerase chain reaction (PCR)/pyrosequencing. Cases with discrepant p16(INK4A) and PCR/pyrosequencing results were further evaluated with HPV in situ hybridization (ISH). SCCs were divided into keratinizing SCC and nonkeratinizing SCC groups and site of origin. RESULTS:Metastatic oropharyngeal nonkeratinizing SCC in the study set exhibited diffuse, strong p16(INK4A) (7 of 7) and HPV16 DNA positivity (6 of 6), while keratinizing SCC from the larynx and oral cavity was negative for p16(INK4A). p16(INK4A) reactivity in the branchial cleft cyst study set was characterized by focal, strong staining (6 of 21) involving the superficial squamous epithelium. HPV DNA was identified in 7 of 19 branchial cleft cyst study set cases by PCR/pyrosequencing, but these cases were negative by HPV ISH. In the test set, oropharyngeal nonkeratinizing SCC exhibited diffuse, strong p16(INK4A) (3 of 3) and HPV16 DNA (2 of 2), while metastatic keratinizing SCC was negative for p16(INK4A) and HPV DNA. All 4 FNABs of branchial cleft cysts were negative for p16(INK4A). Diffuse, strong p16(INK4A) correlated with oropharyngeal origin (P=.001) and nonkeratinizing morphology (P=.0001). CONCLUSIONS:Branchial cleft cysts can exhibit focal strong reactivity limited to the superficial squamous epithelium and glandular epithelium. Although p16(INK4A) immunohistochemistry may be helpful in distinguishing oropharyngeal nonkeratinizing SCC from branchial cleft cysts in FNAB specimens, it is not helpful in cases of keratinizing SCC because these cases are typically negative for p16(INK4A).
journal_name
Cancerjournal_title
Cancerauthors
Pai RK,Erickson J,Pourmand N,Kong CSdoi
10.1002/cncy.20001subject
Has Abstractpub_date
2009-04-25 00:00:00pages
108-19issue
2eissn
0008-543Xissn
1097-0142journal_volume
117pub_type
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