The inferential results regarding the association between the degree of tumor differentiation and the immunoexpression of TS, COX2, EGFR, MLH1, MSH6 and p53 showed that the degree of tumor differentiation was not associated with the immunoexpression of TS (P = 0.138), COX2 (P = 0.428), EGFR (P = 0.103), MSH6 (P = 0.876), MLH1 (P = 0.792) or p53 (P = 0.884). This evidence concerns the gene PTGS2 and neoplasm.