KLF4 and head and neck squamous cell carcinoma: Conversely, the KLF4 levels were higher in epithelial-like cancer types, such as the head and neck squamous cell carcinoma (HNSC), esophageal carcinoma (ESCA), stomach adenocarcinoma (STAD), and cervical carcinoma (CESC) samples (shown in blue; Figure 3G).