To investigate the clinical relevance of TTN-AS1 expression in BC, we retrieved public TCGA data sets from cBioPortal (Cerami et al., 2012; Gao et al., 2013) and evaluated TTN-AS1 expression in relation to disease-free survival (DFS) data as well as overall survival (OS) data on 322 BC patients. The gene discussed is TTN; the disease is breast cancer.