Tumor-derived circulating endothelial cell clusters in colorectal cancer

Area of Science:

• Oncology
• Vascular Biology
• Cancer Diagnostics

Background:

• Circulating tumor cell (CTC) clusters are frequently detected in cancer patients' blood.
• Previous research has largely considered these clusters as malignant entities.
• Comprehensive characterization of these circulating cell clusters remains limited.

Purpose of the Study:

• To investigate the true nature of circulating cell clusters found in colorectal cancer patients' blood.
• To determine if these clusters are indeed malignant or possess a different cellular origin.
• To explore the potential diagnostic utility of these clusters in colorectal cancer detection.

Main Methods:

• Isolation and characterization of circulating cell clusters from colorectal cancer patients.
• Phenotypic analysis using epithelial and mesenchymal markers.
• Genetic analysis to compare clusters with matched primary tumors.
• Transcriptomic analysis of single clusters.
• Investigation of cluster formation mechanisms (coagulation, outgrowth).

Main Results:

• Circulating cell clusters are composed of tumor-derived endothelial cells, not cancerous cells.
• These clusters express both epithelial and mesenchymal markers but lack tumor-specific genetic variations.
• Transcriptomic data confirm an endothelial phenotype traceable to tumor vasculature.
• Clusters are released directly from tumor vasculature, not formed by coagulation or single cell outgrowth.
• Enumeration of these benign clusters accurately distinguished healthy individuals from early-stage colorectal cancer patients.

Conclusions:

• Circulating cell clusters in colorectal cancer are benign, tumor-derived endothelial cell aggregates.
• These clusters represent a novel biomarker for noninvasive early-stage colorectal cancer screening.
• They offer insights into tumor vasculature, distinct from circulating tumor cells (CTCs).