Therefore, we investigated the influence of K‐234 on the growth of other types of Ewing's sarcoma, including SK‐ES‐1, RD‐ES, and MHH‐ES‐1 cells with type 2 fusion and CADO‐ES1 cells the EWS‐ERG fusion.21 Here, EWSR1 is linked to Ewing sarcoma.