CDK6 and neoplasm: In p53 wild-type tumors, CDK6 expression was significantly associated with age (p = 0.002), menopausal status (p = 0.035), tumor grade (p < 0.0001), histologic subtype (p < 0.0001), molecular subtype (p = 0.017), NPI (p = 0.039), and Ki67 proliferative index (p = 0.03) (Supplementary Table 5).