title: Blastic plasmacytoid dendritic cell neoplasm expressing the CD13 myeloid antigen.
abstract: Blastic plasmacytoid dendritic cell neoplasm (BPDCN), currently considered to originate from immature plasmacytoid dendritic cells (DC), is a rare and aggressive CD4+CD56+ neoplasm that frequently involves the skin and bone marrow. We present a case of an 80-year-old man with a CD4+CD56+ BPDCN that affected the orbital cavity and bone marrow. Although BPDCN has not been reported to express any lineage-specific markers, the neoplastic cells strongly expressed the CD13 antigen. Therefore, in addition to pathological examination, we attempted to induce in vitro morphological and surface marker changes with IL-3 and CD40 ligand. After treatment with these cytokines, the tumor cells enlarged markedly, acquired many fine dendrites, similar to mature DC, and showed enhanced expression of antigens specific to DC or antigen-presenting cells, such as CD40, CD80, CD83 and CD86. To the best of our knowledge, this is the first report of BPDCN expressing a myeloid antigen, CD13, although CD33 expression has been described in some cases. The present patient received 2 courses of combination chemotherapy consisting of cytarabine and etoposide, which resulted in complete remission. Given that the cellular origin of plasmacytoid DC is still controversial, myeloid antigen expression involving CD13 may not exclude a diagnosis of BPDCN.
authors.affiliation: Department of Hematology and Clinical Immunology, Kobe City Medical Center General Hospital, Kobe, Japan. daichi-i@hotmail.co.jp
authors.forename: Daichi
authors.initials: D
authors.lastname: Inoue
authors.forename: Kyoko
authors.initials: K
authors.lastname: Maruyama
authors.forename: Kazunari
authors.initials: K
authors.lastname: Aoki
authors.forename: Seiji
authors.initials: S
authors.lastname: Nagano
authors.forename: Hayato
authors.initials: H
authors.lastname: Maruoka
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Imai
authors.forename: Kiminari
authors.initials: K
authors.lastname: Ito
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Takayuki
authors.initials: T
authors.lastname: Takahashi
mesh_terms: D000369:Aged, 80 and over; D000740:Anemia / Q000209:etiology*; D019046:Bone Marrow Neoplasms / Q000097:blood / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D018826:CD13 Antigens / Q000378:metabolism*; D003713:Dendritic Cells / Q000473:pathology*; D006801:Humans; D008297:Male; D054219:Neoplasms, Plasma Cell / Q000097:blood / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D009918:Orbital Neoplasms / Q000097:blood / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology
chemical_list: D018826:CD13 Antigens