Blastic plasmacytoid dendritic cell neoplasm (BPDCN) is an aggressive orphan hematologic cancer with a poor prognosis, and is derived from plasmacytoid dendritic cells that overexpress interleukin-3 receptor subunit alpha (IL3RA or CD123). This evidence concerns the gene IL3RA and CD4+/CD56+ hematodermic neoplasm.