Evidence map›Paper›PMID 25485508›Full record

ArticleCell cycle (Georgetown, Tex.)2014

Loss of circadian clock gene expression is associated with tumor progression in breast cancer.

Cristina Cadenas, Leonie van de Sandt, Karolina Edlund, Miriam Lohr, Birte Hellwig, Rosemarie Marchan, Marcus Schmidt, Jörg Rahnenführer, Henrik Oster, Jan G Hengstler

Open access · hybridAbstract read
In one paragraph

Article in Cell cycle (Georgetown, Tex.), 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 142 papers.

0numbers the graph read from it
0cells of the map it votes in
142citing papers in PubMed
6.3field-weighted citation impact, top 2% 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

142 citing papers in PubMed, 232 citations in OpenAlex.

  1. Article
  2. Article
  3. Review
  4. Review
  5. Metastasis in biological time.Frontiers in cell and developmental biology · 2026
    Review
  6. Circadian clock and cancer.Military Medical Research · 2026
    Review
  7. Article
  8. Review
  9. Article
  10. Targeting Cryptochromes in Chronic Diseases.Cell biology international · 2025
    Review
  11. Article
  12. Article
  13. Review
  14. Article
  15. Review
  16. Review
  17. Article
  18. Review
  19. Article
  20. Article

82 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

10 authors at 4 institutions in 1 country.

Cristina Cadenasa Leibniz Research Centre for Working Environment an Human Factors (ifADo) at the TU Dortmund University ; Dortmund , Germany.
Leonie van de Sandt
Karolina Edlund
Miriam Lohr
Birte Hellwig
Rosemarie Marchan
Marcus Schmidt
Jörg Rahnenführer
Henrik Oster
Jan G Hengstler
TU Dortmund University · DEJohannes Gutenberg University Mainz · DELeibniz Research Centre for Working Environment and Human Factors · DEUniversity of Lübeck · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Several studies suggest a link between circadian rhythm disturbances and tumorigenesis. However, the association between circadian clock genes and prognosis in breast cancer has not been systematically studied. Therefore, we examined the expression of 17 clock components in tumors from 766 node-negative breast cancer patients that were untreated in both neoadjuvant and adjuvant settings. In addition, their association with metastasis-free survival (MFS) and correlation to clinicopathological parameters were investigated. Aiming to estimate functionality of the clockwork, we studied clock gene expression relationships by correlation analysis. Higher expression of several clock genes (e.g., CLOCK, PER1, PER2, PER3, CRY2, NPAS2 and RORC) was found to be associated with longer MFS in univariate Cox regression analyses (HR<1 and FDR-adjusted P < 0.05). Stratification according to molecular subtype revealed prognostic relevance for PER1, PER3, CRY2 and NFIL3 in the ER+/HER2- subgroup, CLOCK and NPAS2 in the ER-/HER2- subtype, and ARNTL2 in HER2+ breast cancer. In the multivariate Cox model, only PER3 (HR = 0.66; P = 0.016) and RORC (HR = 0.42; P = 0.003) were found to be associated with survival outcome independent of established clinicopathological parameters. Pairwise correlations between functionally-related clock genes (e.g., PER2-PER3 and CRY2-PER3) were stronger in ER+, HER2- and low-grade carcinomas; whereas, weaker correlation coefficients were observed in ER- and HER2+ tumors, high-grade tumors and tumors that progressed to metastatic disease. In conclusion, loss of clock genes is associated with worse prognosis in breast cancer. Coordinated co-expression of clock genes, indicative of a functional circadian clock, is maintained in ER+, HER2-, low grade and non-metastasizing tumors but is compromised in more aggressive carcinomas.

Indexed as

Breast NeoplasmsCircadian ClocksCLOCK ProteinsFemaleHumansCLOCK ProteinsARNTL/2, aryl hydrocarbon receptor nuclear translocator-like/2BHLHE40/41, basic helix-loop-helix family, member ebreast cancercircadian clockCLOCK, circadian locomotor output cycles kaputclock genesCRY1/2, cryptochrome circadian clock 1/2DBP, D site of albumin promoter (albumin D-box) binding proteinDFS, disease-free survivalER, estrogen receptorestrogen receptorHER2, human epidermal growth factor receptor 2HR, hazard ratiometastasis-free survivalMFS, metastasis-free survivalNFIL3, nuclear factor, interleukin 3 regulatedNPAS2, neuronal PAS domain protein 2NR1D2, nuclear receptor subfamily 1, group D, member 2PER1/2/3, period circadian clock 1/2/3RORA/B/C, RAR-related orphan receptor alpha/beta/gammaSCN, suprachiasmatic nucleustumor progression

Identifiers

PMID25485508
PMCPMC4613905
OpenAlexW2006593535

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LicenceCC BY-NC
Read underepoch 390

Registered trials

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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.