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Prognostic value of histone marks H3K27me3 and H3K9me3 and modifying enzymes EZH2, SETDB1 and LSD-1 in colorectal cancer

  • Original Article – Cancer Research
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Abstract

Purpose

Studies on the performance of epigenetic-based biomarkers in colorectal cancer (CRC) are scarce and have shown contradictory results. Thus, we sought to examine the prognostic value of histone-modifying enzymes (EZH2, SETDB1 and LSD-1) and histone post-translational marks (H3K27me3 and H3K9me3) in CRC.

Methods

A retrospective series of 207 CRC patients primarily submitted to surgery in a cancer center was included in this study. Clinicopathological data were retrieved. One representative paraffin block per case was selected for immunohistochemistry, including normal and CRC tissues whenever possible. The percentage of positive nuclear staining (digital image analysis) was used to classify patients into “low” and “high” expression groups for each biomarker. Correlations between immunoexpression levels, clinicopathological features and clinical outcomes [disease-specific (DSS) and disease-free (DFS) survival] were examined. Statistical significance was set at p < 0.05.

Results

CRC tissues showed significantly lower expression of SETDB1 and higher expression of the remainder four biomarkers compared to normal mucosa. High EZH2 expression correlated with disease recurrence/progression, whereas low LSD1 expression and high H3K9me3 and H3K27me3 expression were associated with more advanced stage. In multivariable analysis, cases with high LSD1 expression displayed significantly better DSS and DFS (HR 0.477, 95% confidence interval: 0.247–0.923) adjusted for pathological TNM stage.

Conclusion

EZH2, SETDB1, LSD1, H3K9me3 and H3K27me3 expression are altered in CRC and may play a role in colorectal carcinogenesis. LSD1 immunoexpression levels independently predicted patient outcome in this cohort. Further investigations, using larger series, are warranted to confirm its potential clinical value and unravel underlying molecular mechanisms.

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Abbreviations

CI:

Confidence interval

CRC:

Colorectal cancer

DFS:

Disease-free survival

DSS:

Disease-specific survival

EZH2:

Enhancer of zeste homolog 2

HR:

Hazard ratio

H3K9me3:

Histone H3 lysine 9 trimethylation

H3K27me3:

Histone H3 lysine 27 trimethylation

IHC:

Immunohistochemistry

LSD-1:

Lysine-specific demethylase-1

NOS:

Not otherwise specified

SETDB1:

SET domain bifurcated 1

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Funding

This study was funded by Research Center of Portuguese Oncology Institute of Porto (Grant number PI 74-CI-IPOP-19-2016) and by European Community’s Seventh Framework Programme—Grant number FP7-HEALTH-F5-2009-241783.

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Correspondence to Rui Henrique.

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Conflict of interest

The authors have no conflict of interest to declare.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.

Additional information

Carmen Jerónimo and Rui Henrique jointly served as senior authors

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Carvalho, S., Freitas, M., Antunes, L. et al. Prognostic value of histone marks H3K27me3 and H3K9me3 and modifying enzymes EZH2, SETDB1 and LSD-1 in colorectal cancer. J Cancer Res Clin Oncol 144, 2127–2137 (2018). https://doi.org/10.1007/s00432-018-2733-2

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  • DOI: https://doi.org/10.1007/s00432-018-2733-2

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