WT1 and Ewing sarcoma: To determine the role of SIK1 in DSRCT, we depleted SIK1 in JN, BER, and A673 cells, an Ewing Sarcoma cell line, with two independent siRNAs against EWSR1-WT1, SIK1, or a scramble siRNA (Fig. 3A and Supplement Fig. S3).