For example, chimeric RNAs of well-known fusions such as JAZF1-JJAZ1 (SUZ12) and PAX3-FOXO1 are sometimes expressed in the normal cells, despite being frequently detected in endometrial stromal sarcomas and alveolar rhabdomyosarcomas, respectively (38–40). This evidence concerns the gene SUZ12 and endometrioid stromal sarcoma.