According to the results of microarray analysis of proliferation-regulating genes (CDKN2B, MKI67, CDC2/CDK1 and CCNE1), significant mRNA expression alterations were detected by the value of Fold changes (FC≤0.5 or FC≥2) and the ANOVA-test (p<0.05) in Children vs. Normal and Normal vs. CRC comparisons; and these results were also confirmed with Tukey-test in case of CDC2/CDK1 and CCNE1. This evidence concerns the gene MKI67 and colorectal carcinoma.