Sample Abstract and Guidelines for Preparation of Abstracts Ideal Typeface Size Epstein-Barr virus particles in squamous cell carcinoma of the bronchus. PJ BALOYI, JM NKOSI*, S MATHIBI. Department of Pathology, University of Azania, Republic of Azania baloyi@UAZ.ac.aa This study was undertaken to determine the presence of Epstein-Barr (EBV) DNA in squamous cell carcinoma of the bronchus. Formalin fixed, paraffin embedded blocks of bronchial squamous cell carcinoma diagnosed between 2000 and 2006 were retrieved from the files of the Department of Pathology at the University of Azania. Sixty cases were selected that showed normal appearing overlying epithelium, the submucosa of which were infiltrated by a squamous cell carcinoma. All patients gave a history of tobacco use for longer than 10 years. A control group consisted of 40 wax blocks of biopsies taken of non-neoplastic epithelial lesions of the bronchus in long term tobacco users. A standard PCR reaction was employed to amplify the EBV BAM HI W- fragment using a nested primer set (Ross et al 1992). The PCR sensitivity was adjusted to detect one EBV genome per reaction. All results were confirmed with Southern blotting using the EBV BAM HI W-fragment as a probe. EBV DNA was demonstrated in 14/60 (23%) in the carcinoma group and 2/40 (5%) in the control group. This difference was statistically highly significant (p<0.01) Stratification of the experimental group according to age, showed a significantly higher rate of positivity (40%) in patients younger than 40 years (p<0.05) The results demonstrated that EBV DNA was present in significantly more cases in the squamous cell carcinoma group than in nonneoplastic epithelium. EBV may be an etiological factor in bronchus carcinomas in the population studied, particularly in the age group below 40 years. This study was supported by Grant X20, MRC, Azania. 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