Project description:Base of tongue squamous cell carcinoma (BTSCC) is a common tumor of oropharynx worldwide. In addition, BTSCC is a lethal disease and its treatment results in significant disability. Considerable importance is given in lifestyle, particularly tobacco and alcohol use, in cases of BTSCC. It was postulated that BTSCC arises if the ability to metabolize carcinogens, to repair DNA damage and to control cell signaling and cell cycle are defective in individuals with continued exposure to benzo(a)pyrene, ethanol and acetaldehyde. Since these abilities are inherited and vary among human beings, healthy individuals may be at distinct risks for BTSCC. Affymetrix SNP arrays were performed according to the manufacturer's directions on DNA extracted from peripheral blood samples.
Project description:Tongue squamous cell carcinoma is a tumour type with rather low five year survival, around 60%. The poor survival rate has been ascribed to late detection, a high frequency of locoregional recurrence, the occurrence of secondary primary tumours and death due to comorbidity. One reason for development of recurrence is thought to be the existence of transformed cells in areas adjacent to the primary tumour, cancerization field effect. The aim of this study was to map the changes in the tumour free tongue tissue adjacent to tongue tumours compared with healthy control tongue tissue to better understand the cancerization field effect. Tissue biopsies were collected from tumour (T) and tumour free tissue adjacent to the tumour (TF) from patients with tongue squamous cell carcinoma. Control tissue was collected from latter border of the tongue of tumour free healthy volunteers (C). All samples were homogenized and RNA was extracted. The RNA was biotin labelled and run on Illumina HT-12 bead chip array.
Project description:DNA methylation profiling of heterogeneous head and neck squamous cell carcinoma (HNSCC) cohorts has been reported to predict patient outcome. We investigated if a prognostic DNA methylation profile could be found in tumour tissue from a single uniform subsite, the oral tongue. The methylation status of 83 comprehensively annotated oral tongue squamous cell carcinoma (OTSCC) formalin-fixed paraffin-embedded (FFPE) samples from a single institution were examined with the Illumina HumanMethylation450K (HM450K) array.
