The correlation between the immunostains for p53 and Ki67 with bcl-2 expression and classical prognostic factors in colorectal carcinomas.

UNLABELLED The prognostic role of p53 and Ki67 in colorectal carcinomas (CRC) is very controversial in the literature. In our study, we tried to find if their immunostains are correlated with bcl-2 expression or other classical prognostic factors (sex, age, localization and size of tumor, the grade and staging of tumor). We studied 507 cases with CRC and chose 38 cases in which we realized these correlations. Fourteen cases were mucinous CRC, the other 24 cases being non-mucinous CRC (six well differentiated, 13 moderate and five poorly differentiated). For statistical analysis, we used the Statistical Program Graph Pad In Stat 3-Trial Version. We considered the significant association when p<0.05, with 95% confidence interval. RESULTS The median value was 75% for p53 expression, respectively 35% for Ki67 expression. Bcl-2 was positive in 47% of cases but not correlated with p53 or Ki67. We found a significantly statistical decrease p53 immunostain with grade of tumor (70% in well differentiated, respectively 40% in poorly differentiated CRC) and increase of Ki67 median expression (25% in well differentiated, respectively 60% in poorly differentiated CRC). Ki67 was correlated with age of patients, lymph node involvement, being more expressed in N2 (80%) than in N0 (22.5%) and with Dukes MAC staging (25% in B1, 60% in C2). P53 was correlated with age of patients and pT component, after pTNM staging (75% in pT2, 40% in pT4). P53 was not correlated with Ki67. CONCLUSION The CCR prognostic is not determined only by proliferative capacity of tumoral cells.