Data on translocation status are not available in SEER, and therefore, it is not known to what extent patients with PNET harbored typical translocations or potentially may have included some patients with more recently recognized Ewing-like sarcoma entities (e.g., CIC/DUX4 or BCOR/CCNB3 tumors) [18, 19]. Here, DUX4 is linked to primitive neuroectodermal tumor.