PCAT7 and lung cancer: In the current study, using RNA FISH and nuclear–cytoplasmic fractionation assays, we found that PCAT7 can be mainly detected in the cytoplasm of PCa cells, suggesting that PCAT7 may function as a ceRNA in bone metastasis of PCa, which is also supported by previous findings in nasopharyngeal carcinoma and nonsmall cell lung cancer (Liu et al., 2017b; Liu et al., 2017a).