The etiology of CCSLGT is unknown, but many studies have shown associations with EWSR1-CREB1 gene fusions and, less frequently, with EWSR1-ATF1 fusions.    ///    "The etiology of CCSLGT is unknown, but many studies have shown associations with EWSR1-CREB1 gene fusions and, less frequently, with EWSR1-ATF1 fusions. "