CELF1 has been found involved in previous fusions with five different partners: with MTCH2 and MYOM1 in SCC and adenocarcinoma of the lung, respectively; with LUZP2 and ARFGAP2 in adenocarcinoma of the breast; and with BBOX1 in grade I-II astrocytoma of the brain [13]. The gene discussed is ARFGAP2; the disease is breast adenocarcinoma.