The Use of CellCollector Assay to Detect Free Cancer Cells in the Peritoneal Cavity of Colorectal Cancer Patients: An Experimental Study.

Background: Colorectal cancer (CRC) is associated with high incidence and mortality rates globally. The presence of intraperitoneal free cancer cells (IFCCs) is recognized as an independent prognostic factor for CRC patients. However, a clinical gold standard for IFCCs detection is lacking. The GILUPI CellCollector has demonstrated high sensitivity and specificity in detecting free cancer cells, yet its application for CRC IFCCs detection remains unreported. Methods: We selected CRC and normal cell lines to evaluate the CellCollector's ability to detect tumor cells. A total of 70 CRC patients and 17 patients with benign disease undergoing laparoscopic procedures were investigated. Peritoneal lavage fluid was collected pre‐ and post‐operation, and both real‐time PCR (CEA mRNA) and CellCollector detection were performed. We compared the sensitivity and specificity of these two methods. Results: CellCollector can distinguish well between CRC and normal cells in cell line experiments. CellCollector detects IFCCs better than real‐time PCR (CEA) in CRC patients in different TNM Stages. The sensitivity of CellCollector was higher than that of real‐time PCR (84.6% vs. 48.4%), and the specificity of CellCollector was also higher than real‐time PCR (79.1% vs. 60.4%). There was no significant difference in the results of IFCCs detected by CellCollector before and after total mesorectal excision (TME) or complete mesocolic excision (CME) radical colorectomy (p > 0.05), but there was a significant difference in real‐time PCR detection (p < 0.05). Conclusions: The CellCollector demonstrates superior sensitivity and specificity compared to real‐time PCR for detecting IFCCs in CRC patients, suggesting its potential as a clinical tool for IFCCs detection. Trial Registration: ClinicalTrials.gov identifier: NCT01978444 [ABSTRACT FROM AUTHOR]