CLEC4C and CD4+/CD56+ hematodermic neoplasm: The diagnosis of BPDCN needs the presence of at least 4 of the following 6 antigens: CD4, CD56, CD303/BDCA-2, TCL-1, CD2AP and CD123, along with the absence of lineage-specific markers according to the 5th edition of the World Health Organization Classification of Haematolymphoid Tumours (13).