Frequent epigenetic silencing of the FHIT gene in penile squamous cell carcinomas

Department of Pathology, Yamagata University School of Medicine, 2-2-2 Iida-Nishi, Yamagata 990-9585, Japan.
Archiv für Pathologische Anatomie und Physiologie und für Klinische Medicin (Impact Factor: 2.65). 05/2008; 452(4):377-82. DOI: 10.1007/s00428-008-0597-6
Source: PubMed


Methylation of normally unmethylated CpG-rich islands in or near the promoter region has been associated with transcriptional inactivation of tumor-suppressor and tumor-related genes in human cancers. However, so far, only a few studies have searched for DNA methylation in penile carcinoma (PC). On the other hand, human papillomavirus (HPV) has been reported to be associated with the pathogenesis of PC. To elucidate the methylation status of PC and HPV infection, the methylation status of eight genes (DAPK, FHIT, MGMT, p14, p16, RAR-beta, RASSF1A, and RUNX3), the incidences of the HPV status, and the expression of Fhit protein were examined in 25 PCs. The frequencies of methylation were: 28% for DAPK, 92% for FHIT, 20% for MGMT, 4% for p14, 24% for p16, 24% for RAR-beta, 12% for RASSF1A, and 44% for RUNX3. Negative expression of Fhit protein was observed in 22 of the 25 cancers (88%). Among those 22, 20 showed methylation of the FHIT gene. HPV-DNA was detected in three of the 25 cancers (12%). Methylation of FHIT gene was frequently found than HPV infection, therefore methylation of the FHIT gene is suggested to play an important role in the pathogenesis of penile squamous cell carcinoma.

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    • "Our results are in agreement with several previous studies indicating that the loss of FHIT expression is frequent in a variety of tumors [25,26] above all in PVs induced cervical lesions [11,22,27,28]. Lowered levels of the FHIT protein were also documented in pagetoid variant of BPV induced urothelial tumour [18]. "
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