Intraepithelial CD8+ T-cell-count becomes a prognostic factor after a longer follow-up period in human colorectal carcinoma: Possible association with suppression of micrometastasis

T. Chiba, H. Ohtani, T. Mizoi, Y. Naito, E. Sato, H. Nagura, A. Ohuchi, K. Ohuchi, K. Shiiba, Y. Kurokawa, S. Satomi

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137 Citations (Scopus)

Abstract

T-cell infiltration into human cancer tissues can be a manifestation of host immune responses to cancer cells. The present study was undertaken to explore the clinicopathoiogical significance of intraepithelial CD8+ T cells using 371 consecutively sampled human colorectal carcinomas. By univariate analysis, we noted that the survival curves by intraepithelial CD8+ T cells became separated only after 1 to 2 years postoperation. Multivariate analyses revealed that the beneficial effect of this factor becomes significant only after a longer (more than 2 year), but not after a shorter (less than 2 year) follow-up period. Furthermore, the number of intraepithelial CD8+ T cells was significantly higher in patients alive for more than 5 years than in patients who either died of cancer after a curative operation or patients who underwent a noncurative operation. Patients' cancer-specific death long after a curative operation is thought to be caused by the growth of micrometastases in other organs or near the primary sites. The effects of intraepithelial CD8+ T cells, therefore, may be mediated by suppression of micrometastasis, rather than suppression of growth in the primary tumour. In conclusion, our data support a hypothesis on the presence of systemic immunosurveillance against micrometastasis of cancer cells.

Original languageEnglish
Pages (from-to)1711-1717
Number of pages7
JournalBritish Journal of Cancer
Volume91
Issue number9
DOIs
Publication statusPublished - 2004 Nov 1

Keywords

  • Colorectal cancer
  • Intratumoral CD8+ T cells
  • Multivariate analyses
  • Tumour immunity

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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