This class also includes mature plasmacytoid dendritic cell proliferation (MPDCP), which is associated with myeloid neoplasms—most often chronic myelomonocytic leukemia (CMML), but also MDS, MPN, and pDC-AML (a form of AML with monocytic differentiation)—that do not express CD56 [1,12,13,14]. This evidence concerns the gene NCAM1 and chronic myelomonocytic leukemia.