Next, we assessed whether or not K‐733 inhibited the tumor growth of other types of Ewing's sarcomas, including TC‐71 with the type 1 fusion gene, SK‐ES‐1 with the type 2 fusion gene, and CADO‐ES1 with the EWS‐ERG fusion gene. Here, EWSR1 is linked to Ewing sarcoma.