CDK1 and pancreatic ductal adenocarcinoma: The alteration of CDK1 has been found in numerous cancer types, including breast cancer (Kim et al., 2008), esophageal adenocarcinoma (Hansel et al., 2005), hepatocellular carcinoma (Wu et al., 2019), pancreatic ductal adenocarcinoma (Piao et al., 2019), and oral squamous cell carcinoma (Chang et al., 2005).