title: Acute promyelocytic leukemia with t(15;17) abnormality after chemotherapy containing etoposide for Langerhans cell histiocytosis.
abstract: BACKGROUND
  Epipodophyllotoxins, etoposide and teniposide, have been shown to be implicated in the development, of acute myelogenous leukemia in patients treated for solid tumors or acute lymphoblastic leukemia. Etoposide has been shown to be an effective agent against Langerhans cell histiocytosis (LCH) and has gained wider use recently for first-line and salvage chemotherapy in cases of systemic LCH.
  
  
  METHODS
  The authors report two patients with secondary acute promyelocytic leukemia (APL) with a t(15;17) abnormality after chemotherapy that included etoposide for the treatment of LCH.
  
  
  RESULTS
  Patient 1, a 6-year-old girl, had APL develop 11 months after cessation of therapy that included vinblastine, prednisolone, and etoposide (9600 mg/m2 in total dose) for LCH. Patient 2, a 3-year-old girl, had APL develop 9 months after cessation of therapy that included vincristine, methotrexate, prednisolone, cyclophosphamide (10,800 mg/m2), and etoposide (4800 mg/m2) for LCH.
  
  
  CONCLUSIONS
  The authors have experience with four patients treated with etoposide for LCH and suggest that there is a predisposition to secondary APL with t(15;17) for patients with LCH treated with etoposide. The authors warn against the imprudent use of etoposide as a first-line therapy for LCH.
authors.affiliation: Department of Pediatrics, Nagoya University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Horibe
authors.forename: T
authors.initials: T
authors.lastname: Matsushita
authors.forename: S
authors.initials: S
authors.lastname: Numata
authors.forename: Y
authors.initials: Y
authors.lastname: Miyajima
authors.forename: I
authors.initials: I
authors.lastname: Katayama
authors.forename: T
authors.initials: T
authors.lastname: Kitabayashi
authors.forename: M
authors.initials: M
authors.lastname: Yanai
authors.forename: N
authors.initials: N
authors.lastname: Sekiguchi
authors.forename: S
authors.initials: S
authors.lastname: Egi
mesh_terms: D002675:Child, Preschool; D002884:Chromosomes, Human, Pair 15; D002886:Chromosomes, Human, Pair 17; D005047:Etoposide / Q000009:adverse effects*; D005260:Female; D006646:Histiocytosis, Langerhans-Cell / Q000188:drug therapy*; D006801:Humans; D007223:Infant; D015473:Leukemia, Promyelocytic, Acute / Q000139:chemically induced* / Q000235:genetics; D014178:Translocation, Genetic
chemical_list: D005047:Etoposide