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Acta Neuropathologica

, Volume 103, Issue 1, pp 1–10 | Cite as

Evaluation of proliferative index and cell cycle protein expression in choroid plexus tumors in children

  • Carlos G. Carlotti
  • Bodour Salhia
  • Sheila Weitzman
  • Mark Greenberg
  • Peter B. Dirks
  • Warren Mason
  • Lawrence E. Becker
  • James T. Rutka
Regular Paper

Abstract

Choroid plexus tumors are papillary neoplasms originating from the epithelium of the choroid plexus within the cerebral ventricles. They may be highly proliferative tumors, but detailed studies confirming their proliferative potential are lacking. Accordingly, we performed a clinicopathological correlation study of neoplasms arising from the choroid plexus in children using immunohistochemistry to characterize both their proliferative potential and their degree of cell cycle dysregulation when compared to non-neoplastic choroid epithelium. Twelve children with choroid plexus papillomas (CPPs) and 11 with choroid plexus carcinomas (CPCs) were identified from the time period 1982–1997. The outcome and survival of these children following treatment was determined from the medical record. Immunohistochemical studies were performed on CPPs and CPCs in this patient population and on non-neoplastic choroid epithelium using antibodies to MIB-1, p53, cyclin E, retinoblastoma protein (pRB), p107, and E2F-1. In 5 children with CPCs, tumor tissue was available for immunohistochemistry at a second surgery after cycles of chemotherapy had been given. The mean survival for patients with CPPs was 8.5 years, and with CPCs 5.2 years with a minimum follow-up of 4 years for the group. The expression of cell cycle markers and MIB-1 was greater in CPCs than in CPPs or normal choroid plexus. The expression of MIB-1, p53, pRB, and E2F-1 was significantly lower in patients with CPCs after chemotherapy than before. The MIB-1 labeling index for CPC patients who are alive and well after treatments was 15.19±3.2 compared to 22.63±3.04 for patients who have died from their disease (P<0.05). We conclude that CPCs in children are characterized by a higher MIB-1 labeling index and greater cell cycle dysregulation than are CPPs. Chemotherapy may work in part on CPCs to decrease their proliferative potential and expression of cell cycle regulatory proteins.

Choroid plexus papilloma Choroid plexus carcinoma Proliferation Cell cycle protein expression 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Carlos G. Carlotti
    • 1
  • Bodour Salhia
    • 1
  • Sheila Weitzman
    • 2
  • Mark Greenberg
    • 2
  • Peter B. Dirks
    • 1
  • Warren Mason
    • 3
  • Lawrence E. Becker
    • 4
  • James T. Rutka
    • 1
  1. 1.Division of Neurosurgery, Suite 1502, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, CanadaCanada
  2. 2.Division of Hematology/Oncology, The Hospital for Sick Children, The University of Toronto, Toronto, CanadaCanada
  3. 3.Division of Neuro-Oncology, Princess Margaret Hospital, The University of Toronto, CanadaCanada
  4. 4.Division of Neuropathology, The Hospital for Sick Children, The University of Toronto, Toronto, CanadaCanada

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