PTEN and gastric carcinoma: Wang et al. [29] proposed that LncRNA MEG3 can promote the proliferation of ovarian carcinoma through PTEN, while Dan et al. [30] suggested that LncRNA MEG3 can hinder the proliferation and metastasis of gastric carcinoma by regulating miR-21, which also confirmed the consistent mechanism of action of LncRNA MEG3 in several tumor diseases.