CEBPB and Ewing sarcoma: We explored potential downstream targets of C/EBPβ by microarray in four Ewing sarcoma cell lines (A673, CHLA9, CHLA10, TC252) harboring altered C/EBPβ-1 expression: C/EBPβ lentiviral knockdown; C/EBPβ-1 retroviral overexpression; C/EBPβ-1 rescue by lentiviral knockdown followed by retroviral overexpression; empty vector and non-targeting shRNA control treatment; and untreated cells (Supplementary Figure 3A, 3C).