Volume 123, Issue 11 pp. 2594-2604
Cancer Genetics

Alterations of 3p21.31 tumor suppressor genes in head and neck squamous cell carcinoma: Correlation with progression and prognosis

Susmita Ghosh

Susmita Ghosh

Department of Oncogene Regulation, Chittaranjan National Cancer Institute, Kolkata, India

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Amlan Ghosh

Amlan Ghosh

Department of Oncogene Regulation, Chittaranjan National Cancer Institute, Kolkata, India

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Guru Prasad Maiti

Guru Prasad Maiti

Department of Oncogene Regulation, Chittaranjan National Cancer Institute, Kolkata, India

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Neyaz Alam

Neyaz Alam

Department of Surgery, Chittaranjan National Cancer Institute, Kolkata, India

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Anup Roy

Anup Roy

Calcutta Medical College and Hospital, Kolkata, India

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Bidyut Roy

Bidyut Roy

Human Genetics Unit, Indian Statistical Institute, Kolkata, India

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Susanta Roychoudhury

Susanta Roychoudhury

Molecular and Human Genetics and Genomic Division, Indian Institute of Chemical Biology, Kolkata, India

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Chinmay Kumar Panda

Corresponding Author

Chinmay Kumar Panda

Department of Oncogene Regulation, Chittaranjan National Cancer Institute, Kolkata, India

Fax: +91-33-2475-7606

Department of Oncogene Regulation, Chittaranjan National Cancer Institute, 37, SP, Mukherjee Road, Kolkata 700026, IndiaSearch for more papers by this author
First published: 15 September 2008
Citations: 49

Abstract

The aim of our study was to analyze the alterations of some candidate tumor suppressor genes (TSGs) viz. LIMD1, LTF, CDC25A, SCOTIN, RASSF1A and CACNA2D2 located in the chromosomal region 3p21.31 associated with the development of early dysplastic lesions of head and neck. In analysis of 72 dysplastic lesions and 116 squamous cell carcinoma of head and neck, both deletion and promoter methylation have been seen in these genes except for CDC25A and SCOTIN where no methylation has been detected. The alteration of LIMD1 was highest (50%) in the mild dysplastic lesions and did not change significantly during progression of tumor indicating its association with this stage of the disease. It was evident that alterations of LTF, CDC25A and CACNA2D2 were associated with development of moderate dysplastic lesions, while alterations in RASSF1A and CACNA2D2 were needed for progression. Novel somatic mutations were seen in exon 1 of LIMD1 (7%), intron 3/exon4 splice junction of LTF (2%) and exon 7 of cdc25A (10%). Quantitative RT-PCR analysis revealed mean reduced expression of the genes in the following order: LTF (67.6 ± 16.8) > LIMD1 (53.2 ± 20.1) > CACNA2D2 (23.7 ± 7.1) > RASSF1A (15.1 ± 5.6) > CDC25A (5.3 ± 2.3) > SCOTIN (0.58 ± 0.54). Immunohistochemical analysis of CDC25A showed its localization both in cytoplasm and nucleus in primary lesions and oral cancer cell lines. In absence of HPV infection, LTF and RASSF1A alterations jointly have adverse impact on survival of tobacco addicted patients. Thus, our data suggested that multiple candidate TSGs in the chromosomal 3p21.31 region were differentially associated with the early dysplastic lesions of head and neck. © 2008 Wiley-Liss, Inc.

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