TUG1 and oral cavity squamous cell carcinoma: Previous studies have reported that TUG1 could affect multiple cell biological functions, such as the normal formation of photoreceptors in the developing retina of rodents23and the growth, proliferation and invasion, and apoptosis of oral squamous cell carcinoma.24, 25, 26, 27 Thus, we hypothesis that TUG1 may have an essential role on the behavior of the trophoblast cells.