title: Primary cutaneous plasmacytoma: a clinicopathological study of two cases with a long-term follow-up and review of the literature.
abstract: BACKGROUND
  Primary cutaneous plasmacytoma (PCP) is a rare type of cutaneous B-cell lymphoma arising primarily in the skin and derived from clonally expanded plasma cells with a various degrees of maturation and atypia. The disease is rare with only 30 cases reported so far.
  
  
  METHODS
  Two cases of PCP with long-term follow-up of 17 and 15 years are presented.
  
  
  CONCLUSIONS
  Both patients were men with nodular lesions on the face. Histologically, the lesions were composed predominantly of variably maturated plasma cells with monotypic expression of immunoglobulin (Ig) lambda chains. Polymerase chain reaction for IgH genes did not reveal clonal rearrangement. Our cases are discussed in the context of previously reported cases of PCP with a long-term follow-up. We also include a review of all cases of PCP with known tumor progression earlier in the course of the disease (local relapse or visceral spread) to determine the clinical course of this primary cutaneous lymphoma.
authors.affiliation: Department of Dermatology, University Hospital, Zürich, Switzerland.
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Kazakov
authors.forename: Irena E
authors.initials: IE
authors.lastname: Belousova
authors.forename: Beatrix
authors.initials: B
authors.lastname: Müller
authors.forename: Gabriele
authors.initials: G
authors.lastname: Palmedo
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Samtsov
authors.forename: Günter
authors.initials: G
authors.lastname: Burg
authors.forename: Werner
authors.initials: W
authors.lastname: Kempf
mesh_terms: D000328:Adult; D000970:Antineoplastic Agents / Q000627:therapeutic use; D003131:Combined Modality Therapy; D004273:DNA, Neoplasm / Q000032:analysis; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D010954:Plasmacytoma / Q000235:genetics / Q000473:pathology* / Q000628:therapy; D016133:Polymerase Chain Reaction; D011447:Prospidium / Q000627:therapeutic use; D011878:Radiotherapy; D012878:Skin Neoplasms / Q000235:genetics / Q000473:pathology* / Q000628:therapy
chemical_list: D000970:Antineoplastic Agents; D004273:DNA, Neoplasm; D011447:Prospidium