High ectopic expression of CDK7 has been detected in multiple types of cancers, including gastric cancer, oral squamous cell carcinoma, and breast cancer, and is associated with aggressive clinicopathological features and poor prognosis (Wang et al., 2016a; Li et al., 2017; Jiang et al., 2019; Diab et al., 2020). Here, CDK7 is linked to breast cancer.