We also observed comparable synergistic effects between CB‐6644 and JQ1 in a variety of patient‐derived Ewing Tumor Family cells, including the EwS (TC‐106 and CHLA99) and PNET (CHLA9 and CHLA10) samples obtained from the Childhood Cancer Repository (Figure 6M). This evidence concerns the gene EWSR1 and childhood malignant neoplasm.