EWSR1 and clear cell sarcoma: Since then, numerous other studies have supported the association between HCCC and EWSR1 rearrangement.6, 10, 17 However, it is worth noting that the EWSRl::AFT1 gene is not unique to HCCC and can also appear in other tumors such as soft tissue clear cell sarcoma and vascular fibrohistiocytoma.18