Journal of Clinical Immunology

, Volume 26, Issue 5, pp 447–456 | Cite as

Ex-Vivo Analysis of CD8+ T Cells Infiltrating Colorectal Tumors Identifies a Major Effector-Memory Subset with Low Perforin Content

  • LI QU
  • JIN GU

Previous studies have indicated that the infiltration of CD8+ T cells in colorectal cancer is an independent predictor of increased survival but clinical observations have suggested that the cytotoxic function of CD8+ T cells infiltrating colorectal cancer may often be limited. In this study, we have assessed the phenotype of colorectal cancer CD8+ tumor-infiltrating lymphocytes (TILs) isolated ex vivo from tumor tissue, and assessed the perforin content of TIL with respect to their location using immunohistochemistry. We found that CD8+ T cells TILs isolated from colorectal cancer are mainly composed of antigen-experienced cells of effector memory type (TEM, CD45RA-CCR7−, and CD27+/CD28− or CD27−/CD28−), and contain only minor proportions of terminally differentiated CD8+ T cells (TEMRA, CD45RA+CCR7−). The perforin content of these TILs, however, is significantly lower than that of antigen-experienced T cells in PBMCs due to the much lower levels of perforin found in the CD27-CD28− subset in TILs compared with CD8+ T cells of similar phenotype in PBMCs.


Tumor infiltrating lymphocytes phenotype perforin colorectal cancer 



This study was supported by Designed Grant of Cancer Research Institute (New York, NY), New Star Program of Science and Technology of Beijing Science and Technology Committee (H020821070130), “211” Program of Peking University, and Science Foundation of Beijing Cancer Hospital


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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

    • 1
    • 2
    • 4
    • 4
    • 2
    • 2
    • 3
  • LI QU
    • 2
    • 4
    • 4
    • 4
  • JIN GU
    • 1
  1. 1.Department of Colorectal SurgeryPeking University School of Oncology, Beijing Cancer HospitalBeijingP.R. China
  2. 2.Cancer Biological Therapy and Diagnosis CenterPeking University School of Oncology, Beijing Cancer HospitalBeijingP.R. China
  3. 3.Ludwig Institute for Cancer ResearchNew York Branch at Memorial Sloan-Kettering Cancer CenterNew YorkUSA
  4. 4.Department of PathologyPeking University School of Oncology, Beijing Cancer HospitalBeijingP.R. China

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