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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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.
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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