CDK6 and breast cancer: Our data showed that Nar differentially downregulated the expression of Cdk4, Cdk6, and Cdk7 in the human colorectal cancer cell lines SW1116 (Figure 5Aa) and SW837 (Figure 5Ab) and in the human breast cancer cell lines HTB26 (Figure 5Ba) and HTB132 (Figure 5Bb).