ICAM1 and Ewing sarcoma: In order to determine how Ewing cell surface ICAM-1 expression impacts T-cell mediated tumor cell apoptosis, we next treated A673 Ewing sarcoma cells with either an IgG control or ICAM-1 blocking antibody, co-cultured with activated T-cells and assessed for apoptosis using an IncuCyte apoptosis assay.