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Prospective Immunophenotyping of CD8

Jaden D Evans1, Lindsay K Morris1, Henan Zhang2

  • 1Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota.

International Journal of Radiation Oncology, Biology, Physics
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

Metastasis-directed radiation therapy (mdSBRT) impacts CD8+ T-cells in oligometastatic prostate cancer (OPCa). Increased tumor-reactive T-cells (TTR) protect against progression, while central memory T-cells (TCM) correlate with increased mortality risk.

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Area of Science:

  • Immunology
  • Radiation Oncology
  • Prostate Cancer Research

Background:

  • Oligometastatic prostate cancer (OPCa) presents a unique clinical challenge.
  • Understanding the immune microenvironment's response to treatment is crucial for improving outcomes.
  • Metastasis-directed stereotactic body radiation therapy (mdSBRT) is an emerging treatment modality for OPCa.

Purpose of the Study:

  • To investigate the impact of mdSBRT on CD8+ T-cell subpopulations in patients with OPCa.
  • To correlate post-treatment immunophenotypic changes with clinical outcomes, including survival and disease progression.
  • To identify specific T-cell responses that may predict treatment efficacy.

Main Methods:

  • Prospective isolation of peripheral blood mononuclear cells from 37 OPCa patients undergoing mdSBRT.
  • Immunophenotyping to quantify CD8+ T-cell subpopulations (TTR, effector memory, TCM, effector, naïve).
  • Univariate Cox regression and Kaplan-Meier analysis to assess associations between T-cell changes and clinical outcomes.

Main Results:

  • Median follow-up was 39 months with 3-year overall survival of 78.2%.
  • An increase in central memory T-cells (TCM) post-mdSBRT was associated with an increased risk of death (HR 1.22).
  • An increase in tumor-reactive T-cells (TTR) post-mdSBRT was associated with a reduced risk of local progression (HR 0.80).

Conclusions:

  • Specific CD8+ T-cell dynamics following mdSBRT have prognostic implications in OPCa.
  • Elevated TTR cells correlate with better local control, while increased TCM cells suggest a poorer prognosis.
  • Further research into enhancing T-cell antitumor effects could improve disease control in OPCa.