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Background: Apoptosis is an important mechanism that is responsible for the physiological deletion of harmful, damaged, or unwanted cells. Changed expression of apoptosis-related genes may lead to abnormal cell proliferation and finally to tumorigenesis. Our aims were to analyze the promoter methylation and gene expression profiles of FADD and FAS genes in risk of OSCC. Material and Methods: we analyze the promoter methylation status of FADD and FAS genes using Methylation - Specific PCR (MSP) in 86 OSCC tissues were kept in paraffin and 68 normal oral tissues applied as control. Also, FADD and FAS genes expression were analyzed in 19 cases and 20 normal specimens by Real-Time Reverse- Transcripts PCR. Results: Aberrant promoter methylation of FADD and FAS genes were detected in 12.79 % (11 of 86) and 60.46 % (52 of 86) of the OSCC cases, respectively, with a significant difference between cases and healthy controls for both FADD and FAS genes ( P

To analyze the promoter methylation profile and mRNA expression of the p14ARF gene in oral squamous cell carcinoma (OSCC).Promoter methylation of the p14ARF gene was investigated by methylation-specific polymerase chain reaction in paraffin-embedded tissues from 76 patients with OSCC and 57 oral tissues used as healthy controls. Expression of p14ARF mRNA was also determined using real-time quantitative reverse-transcription PCR. The methylation status and mRNA level profile of the gene and their relationship with clinical data were analyzed.Methylation of the p14ARF gene in OSCC was significantly increased compared to normal control tissues (chi(2) = 16.73, p0.0001). The relative expression of p14ARF mRNA in OSCC was not significantly different from that in healthy control samples.Promoter methylation of p14ARF may be an important mechanism in OSCC, and its determination may be considered an important tool in the early diagnosis and treatment of OSCC.