Changes in the immune cell population and cell proliferation in peripheral blood after gemcitabine-based chemotherapy for pancreatic cancer

Clin Transl Oncol. 2014 Mar;16(3):330-5. doi: 10.1007/s12094-013-1079-0. Epub 2013 Jul 17.

Abstract

Purpose: Regulatory T cells (Tregs) play a role in the immunosuppressive state in pancreatic cancer patients. We aimed to evaluate the changes of immune cells population including Tregs caused by gemcitabine (GEM)-based chemotherapy.

Methods: Fifty-three patients with pancreatic cancer were enrolled in this study, of which 32 received GEM- based chemotherapy. Blood samples were collected before and at least 2 weeks after the last dose of chemotherapy. The peripheral blood mononuclear cells (PBMCs) were subjected to flow cytometry analysis after labeling with anti-CD4, anti-CD25, and anti-Foxp3 antibodies. Other lymphocytes and NK cell markers were also measured. The proliferative capacity of PBMCs stimulated with anti-CD3 was analyzed using H(3) thymidine.

Results: The percentage and number of Tregs were significantly decreased after chemotherapy (p = 0.032, p = 0.003, respectively). The other immune cells and the proliferative capacity did not change.

Conclusion: This study showed that GEM-based chemotherapy produced an immunomodulatory effect via the depletion of Tregs.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Antimetabolites, Antineoplastic / therapeutic use*
  • Cell Proliferation / drug effects*
  • Deoxycytidine / analogs & derivatives*
  • Deoxycytidine / therapeutic use
  • Female
  • Flow Cytometry
  • Gemcitabine
  • Humans
  • Male
  • Middle Aged
  • Pancreatic Neoplasms / blood
  • Pancreatic Neoplasms / drug therapy*
  • Pancreatic Neoplasms / immunology*
  • T-Lymphocytes, Regulatory / drug effects*

Substances

  • Antimetabolites, Antineoplastic
  • Deoxycytidine
  • Gemcitabine