CDK1 and cancer: High levels of expression of CDK1 were correlated with high tumor grade (P < 0.001) and high tumor stage (P = 0.018), as well as with frequent LVI (P = 0.023), muscularis propria invasion (P = 0.011), distant metastasis (P = 0.016), and cancer‐specific death (P = 0.001; Table 1).