TTN-AS1 and cancer: Many lncRNAs, as cancer-promoting factors or tumor suppressors, participate in HCC occurrence and development, for instance, FAL1 [5], MCM3AP-AS1 [6], MALAT1 [7], etc. Reportedly, as an oncogenic lncRNA, lncRNA TTN antisense RNA 1 (TTN-AS1) is implicated in the progression of gastric cancer [8] and esophageal squamous cell carcinoma [9].