ETV6 localized at these longer consecutive GGAA repeats at a higher frequency in Ewing sarcoma than in B lymphocytes or in K-562 leukaemia cells51,52, which express ETV6 (P < 2.2 × 10−16) (Fig. 2e and Extended Data Fig. 3e). Here, ETV6 is linked to Ewing sarcoma.