Internal tandem duplication of BCOR (BCOR‐ITD),7, 8YWHAE‐NUTM2B/E fusion,9, 10 and BCOR‐CCNB3 fusion11 have been reported in CCSK cases; however, the genetic mechanisms associated with tumor recurrence and metastasis are still poorly understood. The gene discussed is BCOR; the disease is clear cell sarcoma of kidney.