Immunohistochemically, the tumor cells can show diffuse staining for CD99 in ∼50% of the reported cases.3 NKX2-2 and PAX7 can also be expressed5,6 and dot-like keratin or epithelial membrane antigen (EMA), focal WT-1, CD138, SATB2, p63, and smooth muscle actin (SMA) staining can be observed in a subset.5,7,8 Desmin, S100, synaptophysin, and chromogranin are negative.4,7–10 Thus, even though NFATC2 rearranged round cell sarcoma and SBC share the same fusion gene, any morphologic and immunohistochemical overlap is absent and their clinical behavior is entirely different. Here, MUC1 is linked to neoplasm.