All the above lncRNAs were then fitted into the multivariate Cox regression model, which indicated that only four lncRNAs—ADAMTS9-AS1, LINC00536, AL391421.1 and LINC00491—had a significant prognostic value in BC (Additional file 3: Figure S2C), and these four lncRNAs were used to develop an lncRNA prognostic model. Here, ADAMTS9 is linked to breast cancer.