For example, Qiu et al. (2014) identified that the lncRNA CCAT2 shows a specific expression in AC and might function as biomarker for lymph node metastasis [69], whereas Chen et al. (2016) recently found that CCAT2 serves also as an independent unfavorable prognostic factor in SCLC patients [70]. Here, CCAT2 is linked to small cell lung carcinoma.