Immunohistochemical and Molecular Studies of p53 and KRAS Protein and Their Relations to Colorectal Carcinoma
The study inc1uded 50 tissue blocks embedded in paraffin wax (16 females and 34 males), obtained from a patients group with (CRC) colorectal cancer , as well as 35 Tissue blocks that were embedded in paraffin wax from norma1 co1on (ulcerative co1itis) as controls. A relatively few oncogenes and most prominently tumor-suppressing genes, Kirastien rat sarcoma virus (KRAS), and P53 genes have been mutated into a significant part of CRCs, and a broad collection of mutated genes has been defined in CRC subsets. Current findings showed very significant differences between patients and control subjects in the p53 positive rate (P<0.001). TP53 Pro/Pro genotype positivity was higher in the contro1 group I than in the patient group I and this was a significant difference (Pi<0.001) with an odd ratio of less than one. The genotype Pro/Pro was considered to be protective against colorectal carcinoma preventively fractured 0.767. The positive rate of p53 Arg/Arg genotype in patients was more frequent and statistically significant (P <0.01), because the odd ratio was more than one. The genotype Arg/Arg would be considered a colorectal carcinoma risk factor. We conclude that p53 over expression is used as an indicator of p53 mutation (as identified by immuno-historic chemistry) and KRAS protein expression was negatively impaired for all the patients in the current study.
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