The ITD in BCOR was identical with the internal tandem duplication in BCOR recently described by Sturm et al. [1] and in clear cell sarcoma of the kidney [2, 3] and consisted in the insertion of one nucleotide and the duplication of 89 nucleotides, leading to an elongated protein (Figure 3C). The gene discussed is BCOR; the disease is clear cell sarcoma of kidney.