Both spindle cells in the corpus uteri and the intra-abdominal mass showed partial nuclear positivity for BCOR (Fig. 4a, b), suggesting that the intra-abdominal mass was a metastatic tumor derived from the preceding uterine adenosarcoma that may carry the JAZF1-BCORL1 fusion gene. This evidence concerns the gene BCOR and uterine corpus adenosarcoma.