CCAT2 and non-small cell lung carcinoma: The subsequent studies have reported that CCAT2 is positively associated with distant metastasis of non-small cell lung cancer [9], breast cancer [10,11], ovarian cancer [1,12,13], cervical cancer [14,15] and gastric cancer [16,17], which suggests that CCAT2 could be a prognostic biomarker for tumor metastasis.