CDK4 and CDK6 expression levels did not show statistically significant differences between the KL and KP tumors; however, patients with K tumors had lower CDK4 (log2-transformed FPKM: 5.55 for K, 5.88 for KL, 5.94 for KP) and higher CDK6 expression (log2-transformed FPKM: 3.75 for K, 2.86 for KL, 3.02 for KP) compared to those with other tumor subtypes (Figure 2B). Here, CDK6 is linked to neoplasm.