Abstract
Objective
Clear cell renal cell carcinoma (ccRCC) is the most common type of kidney tumor characterized by the highest mortality rate of the genitourinary cancers, and, therefore, new diagnostic and/or prognostic biomarkers are urgently needed.
Methods
Based on genome-wide DNA methylation profiling in 11 pairs of ccRCC and non-cancerous renal tissues (NRT), the methylation at regulatory regions of ZNF677, FBN2, PCDH8, TFAP2B, TAC1, and FLRT2 was analyzed in 168 renal tissues and 307 urine samples using qualitative and quantitative methylation-specific PCR (MSP).
Results
Significantly higher methylation frequencies for all genes were found in ccRCC tissues compared to NRT (33–60% vs. 0–11%). The best diagnostic performance demonstrated a panel of ZNF677, FBN2, PCDH8, TFAP2B & TAC1 with 82% sensitivity and 96% specificity. Hypermethylation of ZNF677 and PCDH8 in the tissue samples was significantly related to numerous adverse clinicopathologic parameters. For the urine-based ccRCC detection, the highest diagnostic power (AUC = 0.78) was observed for a panel of ZNF677 & PCDH8 (with or without FBN2 or FLRT2) with 69–78% sensitivity and 69–80% specificity, albeit with lower values in the validation cohort. Besides, methylation of PCDH8 was significantly related to higher tumor stage and fat invasion in the study and validation cohorts. Moreover, PCDH8 was strongly predictive for OS (HR, 5.7; 95% CI 1.16–28.12), and its prognostic power considerably increased in combination with ZNF677 (HR, 12.5; 95% CI 1.47–105.58).
Conclusion
In summary, our study revealed novel, potentially promising DNA methylation biomarkers of ccRCC with the possibility to be applied for non-invasive urine-based ccRCC detection and follow-up.






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Availability of data and materials
All data supporting the results reported in the article is available from the corresponding author upon a reasonable request.
Abbreviations
- AUC:
-
Area under the curve
- ASC:
-
Asymptomatic control
- ccRCC:
-
Clear cell renal cell carcinoma
- CI:
-
Confidence interval
- MC:
-
In vitro methylated control
- MSP:
-
Methylation-specific polymerase chain reaction
- qMSP:
-
Quantitative methylation-specific polymerase chain reaction
- NRT:
-
Non-cancerous renal tissue
- NTC:
-
No-template control
- HR:
-
Hazard ratio
- UC:
-
Unmethylated control
- M:
-
Methylated
- U:
-
Unmethylated
- ROC:
-
Receiver operating characteristic
- AUC:
-
Area under the curve
- DSe:
-
Diagnostic sensitivity
- DSp:
-
Diagnostic specificity
- WHO/ISUP:
-
World health organization/International Society of Urological Pathology
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Acknowledgements
The authors would like to thank Aušra Šumskaitė, Rūta Matuliavičiūtė, and Eugenijus Ganža for their assistance in DNA samples preparation and MSP analysis.
Funding
This work was funded by the 2014–2020 European Union Structural Funds according to the activity "Intelligence. Joint science-business projects" grant No. J05-LVPA-K-04–0029. SJ and KZ were supported by the European Social Fund according to the activity "Development of students' ability to carry out R&D activities" under Measure No.09.03.3-LMT-K-712 "Development of Scientific Competences of Scientists, other Researchers and Students through Practical Research Activities" (grant No. 09.03.3-LMT-K-712–15-0214 to SJ). The study was also partially supported by the Research Council of Lithuania (RCL) grant No. S-MIP-17/54.
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RK: performed the DNA methylation and gene expression analysis in the tissue samples and urine samples of the validation cohort, analyzed the experimental and clinical data and drafted the manuscript; KZ: performed the DNA methylation analysis in urine samples of the study cohort, contributed to gene expression analysis; AZ, AU, RS and AB: collected the clinical data and revised the analysis; RS and AZ: critically revised the manuscript; AU and FJ: coordinated the patient selection, supervised the clinical data analysis and was involved in the conception of the study; SJ: designed the research, supervised the analysis of the clinical and experimental data, and revised the manuscript critically for important intellectual content. All authors read and approved the manuscript and agree to be accountable for all aspects of the research in ensuring that the accuracy or integrity of any part of the work is appropriately investigated and resolved.
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RK and SJ are inventors of the patent application No. PCT/IB2021/052532. The remaining authors declare that they have no conflict of interest.
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The study was approved by the Lithuanian Bioethics Committee (Nr. 158200˗18/12˗1077˗585 for Study cohort and Nr. 158200-18/12-1077-585 for Validation cohort), and written informed consent was obtained from all patients.
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Kubiliūtė, R., Žukauskaitė, K., Žalimas, A. et al. Clinical significance of novel DNA methylation biomarkers for renal clear cell carcinoma. J Cancer Res Clin Oncol 148, 361–375 (2022). https://doi.org/10.1007/s00432-021-03837-7
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DOI: https://doi.org/10.1007/s00432-021-03837-7