Medical Oncology and Tumor Pharmacotherapy

, Volume 9, Issue 2, pp 101–105 | Cite as

P-Glycoprotein expression in refractory hematological neoplasms and circumvention of resistance with verapamil or cyclosporine a containing protocols

  • Meral Beksac
  • Hamd Akan
  • Haluk Ko
  • Osman Lhan
  • Ehsuvar Ertürk
  • Aynur Güneyl
  • Yem Kzünal
  • Orhan S.arda


Either p-glycoprotein (pgp) or the encoding gene mdrl expression has been reported to be correlated with multidrug resistance and poor treatment response. To investigate the incidence of pgp in refractory hematological neoplasms we analyzed malignant cells from 40 patients by an immunoperoxidase method using the monoclonal antibody C219. Pgp was positive in 75 % of acute nonlymphoblastic leukemia (ANLL) and 50 % of acute lymphoblastic leukemia (ALL). Pgp positivity was similarly distributed in both Tdt (-) and (+) ANLLs (64 % versus 100 %). Addition of Verapamil (VRP) (12 patients) or Cyclosporine A (CsA) (7 patients) to the previous chemotherapy protocol resulted in complete response in 7 (58 %) and 3 (43 %) of the patients respectively. Partial response was observed in one patient who received CsA. Both chemosensitizers were tolerated well with few reversible side effects. The preliminary results of this study have been presented in the 15th International Cancer Congress, August 1990-Hamburg, Germany.

Key Words

P-glycoprotein Verapamil Cyclosporine A Refractory hematological neoplasms 







Cyclosporine A


Acute lymphoblastic leukemia


Acute non-lymphoblastic leukemia


Chronic myelogenous leukemia-blastic crisis


Chronic lymphocytic leukemia


Multiple myeloma








Cytosine Arabinoside












Allogeneic Bone Marrow Transplantation


Autologous Bone Marrow Transplantation


Partial response


Complete remission


No response


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Copyright information

© Humana Press Inc. 1992

Authors and Affiliations

  • Meral Beksac
    • 1
  • Hamd Akan
    • 1
  • Haluk Ko
    • 1
  • Osman Lhan
    • 1
  • Ehsuvar Ertürk
    • 1
  • Aynur Güneyl
    • 1
  • Yem Kzünal
    • 1
  • Orhan S.arda
    • 1
  1. 1.Ankara Faculty of Medicineİbn-i Sina Hospital, Department of HematologyAnkaraTurkey (Türkiye)

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