SNHG1 and esophageal squamous cell carcinoma: Among lncRNAs, small nucleolar RNA host gene 1 (SNHG1) is a novel oncogenic lncRNA aberrantly expressed in various types of human cancers [20–28], including hepatocellular carcinoma [20, 29], esophageal squamous cell carcinoma [21], gastric cancer [23], breast cancer [24], prostate cancer [25], acute myeloid leukemia [26], non-small cell lung cancer [27] and colorectal cancer [28].