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Exploring the Utility of Cell-Free DNA Hydroxymethylation Profiling in Small-Cell Lung Cancer.

Janice J N Li1,2, Dangxiao Cheng2, Luna J Zhan2

  • 1Department of Medical Biophysics, Temerty Faculty of Medicine, University of Toronto, 101 College Street, Toronto, ON M5G 1L7, Canada.

International Journal of Molecular Sciences
|May 27, 2026
PubMed
Summary

Cell-free DNA 5-hydroxymethylcytosine (5hmC) profiling reveals distinct epigenetic patterns in small-cell lung cancer (SCLC). This liquid biopsy approach shows promise for SCLC subtyping and risk stratification.

Keywords:
DNA hydroxymethylationbiomarkerscell-free DNAepigeneticssmall-cell lung cancer

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Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Small-cell lung cancer (SCLC) is an aggressive neuroendocrine cancer with poor survival rates.
  • Biomarker discovery in SCLC is challenging due to tumor plasticity and limited tissue, making liquid biopsy approaches promising.
  • Epigenetic dysregulation of DNA 5-hydroxymethylcytosine (5hmC) is a cancer hallmark but is largely unexplored in SCLC.

Purpose of the Study:

  • To characterize the cell-free DNA (cfDNA) 5hmC landscape in SCLC.
  • To evaluate the potential of cfDNA 5hmC as a biomarker in SCLC.
  • To explore applications in tumor subtyping and risk stratification.

Main Methods:

  • Profiling of cfDNA hydroxymethylomes from 107 pre-treatment SCLC patients and 53 controls using the 5hmC-Seal assay.
  • Analysis of cfDNA 5hmC concordance with matched circulating tumor cell patient-derived xenografts (CDX).
  • Correlation of cfDNA 5hmC with transcriptomic data and clinical outcomes.

Main Results:

  • SCLC patients exhibited higher global 5hmC levels compared to controls.
  • Distinct 5hmC enrichment was observed in neurodevelopmental and synaptic pathways, reflecting SCLC's neuroendocrine origin.
  • cfDNA 5hmC accurately reflected tumor epigenetic states and correlated with molecular subtypes.
  • Elevated SCLC-specific 5hmC and extensive stage disease were linked to inferior survival.

Conclusions:

  • cfDNA 5hmC profiling serves as a biologically informative liquid biopsy biomarker for SCLC.
  • This approach demonstrates potential for SCLC tumor subtyping and clinical risk stratification.
  • cfDNA 5hmC analysis offers insights into SCLC's epigenetic landscape and plasticity pathways.