Esophageal cancer, including Squamous Cell Carcinoma and Adenocarcinoma, is one of the most common causes of cancer and cancer death globally, with China alone accounting for about half of the new cases worldwide in 2012. In this study we analyzed the presence of human papilloma virus (HPV) DNA and Tp53 mutations in 52 cancer patients, including 26 Squamous Cell Carcinoma cases, 21 Adenocarcinomas and 5 of non-described histology from Tangshan China. Overall 44 patients were positive for HPV L1 consensus, 28 were positive for HPV16 and 34 for HPV18 (84.62%, 53.82% and 65.38% respectively); 23 samples (44.23%) were positive for both HPV16 and HPV 18. We detected however a very low rate of Tp53 mutations in exons 5 through 8, which may possible be related to the elevated percentage of high risk HPV. Our findings corroborate our previous study on Esophageal Squamous Cell carcinoma in the same area but a further analysis on other Tp53 exons polymorphisms are necessary to understand the reason behind the low level of Tp53 mutations we reported.
Abstract. The Balb/c 3T3 cell transformation assay (CTA) is presently undergoing extensive pre-validation testing but its potential for routine chemical screening remains to be fully exploited due it being more costly and more time consuming than other CTAs. To downscale the assay 24-well plates were used to score foci and then compared to the standard T25 culture bottles. Furthermore, it was also attempted an adaptation to a perfusion cell culture model in order to achieve a closer equivalent to the in vivo carcinogenic processes. The miniaturized approach was successfully correlated to the standard technique. A reproduction in smaller culture plates can provide an alternative for a faster and more practicable handling by smaller laboratories. The assay failed to produce positive results in the fluidic model and further testing is necessary to determine the role medium flow in the in vitro carcinogenesis process.
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