Furthermore, we detected levels of FEZF1-AS1 expression in human retinoblastoma cell lines (Y79, RBL-13 and Weri-RB-1) and human retinal pigment epithelial cell line (ARPE-19), and found FEZF1-AS1 expression was obviously increased in human retinoblastoma cell lines compared with human retinal pigment epithelial cell line (Figure 1B). Here, FEZF1 is linked to retinoblastoma.