CDK4 and benign prostatic hyperplasia: The relative mRNA expression of CDK4, CDK6, and p16INK4a in prostate tumor tissues did not differ significantly from that in BPH tissues [CDK4: median log2(FC) value: 0.02, p = 0.77; CDK6: median log2(FC) value: -0.44, p = 0.09; and p16INK4a: median log2(FC) value: 0.49, p = 0.91].