HDGF and gastric cancer: Overexpression of the lncRNA TDRG1 has been reported to promote the proliferation, migration, invasion, and metastasis of cervical carcinoma [188]; promote gastric cancer through modulation of the expression of hepatoma-derived growth factor (HDGF) [189]; and promote NSCLC with involvement of the zinc finger e-box binding homeobox 1 (ZEB1) [190].