The three patients with immunohistochemically CCNB3-positive tumors were all male, aged between 11 and 17, and confirmed to have the BCOR-CCNB3 fusion transcript by RT-PCR.     ///    We herein retrospectively collected clinicopathologic data on BCOR-CCNB3 sarcoma in the Kyoto University Hospital over the last 10 years.     ///     BCOR-CCNB3 sarcoma is a recently recognized tumor morphologically and clinically simulating Ewing sarcoma.     ///    These results demonstrated that the application of CCNB3 immunostaining was useful for differentiating BCOR-CCNB3 from a group of 'Ewing-like sarcomas' and may contribute to the evaluation of treatment strategies for bone sarcomas.     ///    Screening of BCOR-CCNB3 sarcoma using immunohistochemistry for CCNB3: A clinicopathological report of three pediatric cases.. 