Integrated Cf-miRNA and Exosomal miRNA Signature for Early Detection of Esophageal Squamous Cell Carcinoma

Esophageal cancer is the 11th most common cancer globally and the 7th leading cause of cancer-related death, with an estimated 511,000 new cases and 445,000 deaths annually. ESCC accounts for the majority of cases worldwide. Despite advances in endoscopy and therapy, outcomes for advanced ESCC remain poor, highlighting the pressing need for sensitive, minimally invasive early detection strategies.

Exosomal miRNAs (exo-miRNAs) are selectively released by tumor cells and remain stable in circulation, enabling reliable detection of tumor-specific signals. Cell-free miRNAs (cf-miRNAs) circulate broadly and can reflect overall tumor burden, metastatic spread, and microenvironmental changes.

Previous ESCC biomarker studies were limited by small validation cohorts and reliance on tissue-based public datasets that do not fully capture circulating biomarker patterns. The SYNERGY study addresses these limitations through comprehensive discovery analysis and multi-cohort blood-based validation.

Inclusion criteria

• Adults age 18 to 90 years
• Histologically confirmed esophageal squamous cell carcinoma
• No prior systemic therapy before sample collection
• For control groups: absence of malignant disease

Exclusion criteria

• Lack of informed consent
• Inadequate sample volume or RNA quality
• Prior cancer within 5 years (except localized cancers)
• Active systemic inflammation that may alter circulating RNA profiles