Myeloid suppressor cells in cancer: recruitment, phenotype, properties, and mechanisms of immune suppression

Semin Cancer Biol. 2006 Feb;16(1):53-65. doi: 10.1016/j.semcancer.2005.07.005. Epub 2005 Sep 15.


Growing tumors acquire the ability to resist immune recognition and immune-mediated injury. Among several mechanisms, mouse and human tumors share the ability to alter the normal hematopoiesis, leading to accumulation of cells of the myelo-monoctytic lineage at the tumor site and in different primary and secondary lymphoid organs. These cells aid tumor development by providing molecules and factors essential for tumor growth and neovascularization but also exert a profound inhibitory activity on both tumor-specific and nonspecific T lymphocytes. The present article summarizes recent findings on the interaction between developing cancers and these recently described "myeloid suppressor cells".

Publication types

  • Review

MeSH terms

  • Animals
  • Arginase / metabolism
  • Granulocyte-Macrophage Colony-Stimulating Factor / physiology
  • Humans
  • Immune Tolerance* / drug effects
  • Immune Tolerance* / genetics
  • Mice
  • Myeloid Cells / classification
  • Myeloid Cells / drug effects
  • Myeloid Cells / immunology*
  • Neoplasms / immunology*
  • Nerve Tissue Proteins / pharmacology
  • Nerve Tissue Proteins / physiology
  • Nitric Oxide Synthase / metabolism
  • T-Lymphocytes, Regulatory / drug effects
  • T-Lymphocytes, Regulatory / immunology*
  • T-Lymphocytes, Regulatory / metabolism


  • Nerve Tissue Proteins
  • PDF protein, human
  • Granulocyte-Macrophage Colony-Stimulating Factor
  • Nitric Oxide Synthase
  • Arginase