BPDCN: state of the art.
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The emergence of blastic plasmacytoid dendritic cell neoplasm (BPDCN) as its own distinct entity within the pantheon of hematologic malignancies is due to the growing understanding of its unique multiorgan clinical presentation and characteristic skin lesions. The occurrence of BPDCN is generally heralded by a multicompartmental presentation of violaceous cutaneous lesions, involvement by bone marrow and/or blood, lymph node invasion, and an inclination toward extramedullary organ involvement, including, most remarkably, central nervous system (CNS)/cerebrospinal fluid positivity. With a median age historically of ≥ 70 years and up to 5:1 male predominance in most of the field's earlier studies, the most notable development in the modern era is the recognition of emerging important groups with BPDCN, such as female, pediatric, and adolescent/young adult patients; CNS + BPDCN patients; and an increasing number of cases being diagnosed worldwide. These trends are in line with the increased educational and research efforts, greater international collaboration, and markedly improved diagnostic tools and clinical approaches among hematology/oncology, hematopathology, dermatology, and dermatopathology teams around the world. Now, with over 5 years since the first commercially approved targeted agent specifically dedicated for BPDCN, the CD123-targeted agent tagraxofusp, improvements have been demonstrated particularly in the frontline setting for patients with BPDCN. The field is abundant with hope, as it has experienced advancements including greater molecular characterization, expanded identification of potential targets for therapy beyond CD123, advent of combination therapies, improving parameters for stem cell transplantation, and novel clinical trials specifically available for patients with BPDCN.