Evidence map›Paper›PMID 21093169›Full record

ArticleInternational journal of radiation oncology, biology, physics2011

Radiation enhances regulatory T cell representation.

Evelyn L Kachikwu, Keisuke S Iwamoto, Yu-Pei Liao, John J DeMarco, Nzhde Agazaryan, James S Economou, William H McBride, Dörthe Schaue

Abstract read
In one paragraph

Article in International journal of radiation oncology, biology, physics, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 255 papers.

0numbers the graph read from it
0cells of the map it votes in
255citing papers in PubMed
3.5field-weighted citation impact, top 7% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

255 citing papers in PubMed, 413 citations in OpenAlex.

  1. Trial
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  7. Focal radiotherapy improves CAR T cell therapy targeting prostate cancer.bioRxiv : the preprint server for biology · 2026
    Article
  8. Article
  9. Review
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  12. Immune Predictors of Radiotherapy Outcomes in Cervical Cancer.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026
    Article
  13. Review
  14. Article
  15. Review
  16. Article
  17. Review
  18. Metabolic reprogramming and plasticity of cancer stem cells.Frontiers in cell and developmental biology · 2026
    Review
  19. Review
  20. Review

195 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 1 institution in 1 country.

Evelyn L KachikwuDepartment of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1714, USA.
Keisuke S Iwamoto
Yu-Pei Liao
John J DeMarco
Nzhde Agazaryan
James S Economou
William H McBride
Dörthe Schaue
University of California, Los Angeles · US

Funding

Radiation Affects Tumor Antigen PresentationR01CA101752 · NCI · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI MCBRIDE, WILLIAM H. · 2003 to 2007
$1.7M
PET IMAGING OF MART TCR-ENGINEERED CD8 T CELL IMMUNOTHERAPY IN MANR01CA129816 · NCI · UNIVERSITY OF CALIFORNIA LOS ANGELES · PI ECONOMOU, JAMES S. · 2007 to 2011
$1.4M
NCI NIH HHS R01 CA-101752NCI NIH HHS R01 CA101752NCI NIH HHS R01 CA129816
6 · The paper itself

Abstract

purposeImmunotherapy could be a useful adjunct to standard cytotoxic therapies such as radiation in patients with micrometastatic disease, although successful integration of immunotherapy into treatment protocols will require further understanding of how standard therapies affect the generation of antitumor immune responses. This study was undertaken to evaluate the impact of radiation therapy (RT) on immunosuppressive T regulatory (Treg) cells. METHODS AND MATERIALS: Treg cells were identified as a CD4(+)CD25(hi)Foxp3(+) lymphocyte subset, and their fate was followed in a murine TRAMP C1 model of prostate cancer in mice with and without RT.

resultsCD4(+)CD25(hi)Foxp3(+) Treg cells increased in immune organs after local leg or whole-body radiation. A large part, but not all, of this increase after leg-only irradiation could be ascribed to radiation scatter and Treg cells being intrinsically more radiation resistant than other lymphocyte subpopulations, resulting in their selection. Their functional activity on a per-cell basis was not affected by radiation exposure. Similar findings were made with mice receiving local RT to murine prostate tumors growing in the leg. The importance of the Treg cell population in the response to RT was shown by systemic elimination of Treg cells, which greatly enhanced radiation-induced tumor regression.

conclusionsWe conclude that Treg cells are more resistant to radiation than other lymphocytes, resulting in their preferential increase. Treg cells may form an important homeostatic mechanism for tissues injured by radiation, and in a tumor context, they may assist in immune evasion during therapy. Targeting this population may allow enhancement of radiotherapeutic benefit through immune modulation.

Indexed as

Radiation ToleranceAdenocarcinomaAnimalsBiomarkersCD24 AntigenCD4-Positive T-LymphocytesCell Line, TumorDose-Response Relationship, RadiationFemaleForkhead Transcription FactorsHindlimbImmunotherapyInterleukin-2 Receptor alpha SubunitLymph NodesLymphocyte CountMaleBiomarkersCD24 AntigenForkhead Transcription FactorsFoxp3 protein, mouseIl2ra protein, mouseInterleukin-2 Receptor alpha Subunit

Identifiers

PMID21093169
PMCPMC3117954
OpenAlexW2168244200

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.