CDK6 and retinoblastoma: For the ten RB tumor samples analyzed, the average levels of gene expression as follows: ELK1 (9.21), GTSE1 (6.23), CDK6 (10.76), E2F4 (10.51), DRAM (−4.79), CDH1 (−0.430), and SNAI1 (3.60), Table 2.