MALAT1 and non-small cell lung carcinoma: Previously, MALAT1 was named because of its clinical significance in predicting the metastasis and survival of early NSCLC, but a subsequent study showed that MALAT1 is widely expressed in normal tissues and is extremely abundant and widely conserved in 33 species of mammals (6, 16), which indicates that MALAT1 may have potentially important biological functions (17).