FOXD2 and esophageal squamous cell carcinoma: Overexpressed FOXD2-AS1 is observed in multiple other types of human cancer, including hepatocellular carcinoma (Chang et al., 2018; Zhao et al., 2018; Xu et al., 2019), glioma (Ni et al., 2019), thyroid cancer (Zhang et al., 2018; Jiang et al., 2019; Liu et al., 2019), cutaneous melanoma (Ren et al., 2019), colorectal cancer (Zhu et al., 2018), esophageal squamous cell carcinoma (Bao et al., 2018), and non–small cell lung cancer (Rong et al., 2017).