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PurposeTo detect and quantify the immunoreactivity of TCF4 protein in colorectal carci- noma, colorectal adenoma and non-neoplasic colorectal epithelium.MethodsWe studied 129 individuals: 40 with colorectal cancer, 52 with colorectal ad- enoma and 37 with non-neoplastic colorectal epithelium. The colorectal adenoma and carcinoma samples were obtained from patients who underwent surgical procedures, and colonoscopies and samples of non-neoplastic colorectal epithelium were taken from patients who died from cardiovascular diseases, without diseases of the large intestine. Samples of different tissues were included in paraffin blocks, and the immunohistochem- ical expression of protein TCF4 was analyzed using the technique of tissue microarray (TMA) with polyclonal antibody TCF4. The immunoreactivity was analyzed and classified as positive and negative.ResultsThe immunohistochemical expression of TCF4 protein was significantly higher (p < 0.01) in colorectal carcinoma than in the non-neoplastic colorectal epithelium and adenoma. There was no difference (p = 0.76) between TCF4 protein immunohistochemical expression in colorectal adenoma and non-neoplastic colorectal tissue.ConclusionsTCF4 protein showed a more intense expression in colorectal carcinoma than in non-neoplastic colorectal epithelium and adenoma, indicating that this protein is in- volved in colorectal carcinogenesis

Immunohistochemistry expression of TCF4 protein on carcinoma, adenoma and non neoplastic colorectal mucosa