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en Platelet-Derived circRNAs hsa_circ_0004771 and hsa_circ_0019120 Differentially Expressed in Colorectal Cancer and Polyps زیست شناسی ملکولی Molecular Biology مقالات اصلی Original Article <div style="text-align: justify;">Background: Colorectal cancer (CRC) is the second most common cause of cancer-related deaths worldwide. Early detection is crucial for improving survival rates. Liquid biopsies, specifically analyzing circulating tumor-educated platelets (TEPs), have emerged as a promising tool for early CRC detection and monitoring treatment efficacy. This study investigated the expression levels of two specific circRNAs, hsa_circ_0004771 and hsa_circ_0019120, in the platelets of patients with CRC, advanced polyps, and healthy controls. Methods: Blood samples were obtained from 25 individuals with CRC, 25 individuals with advanced polyps, and 25 healthy controls. Platelet-derived total RNA was extracted, and expression analysis was conducted using reverse transcription quantitative PCR (RT-qPCR). Differential expression and receiver operating characteristic (ROC) curve analysis were performed using GraphPad Prism. Results: Both circRNAs were found to be upregulated in platelets from individuals with advanced polyps and CRC compared to healthy individuals. However, the upregulation was statistically significant only for hsa_circ_0004771 in CRC patients (p-value = 0.0036) and for hsa_circ_0019120 in both advanced polyp (p-value = 0.0175) and CRC patients (p-value = 0.0356). The combined analysis of both circRNAs achieved an area under the curve (AUC) of 0.8348 (95% CI: 0.7131 to 0.9565) with a sensitivity of 84% and specificity of 80% (p-value = 0.0002). Conclusions: This study showed that hsa_circ_0004771 and hsa_circ_0019120 dysregulated in both CRC and polyps and have potential as a novel diagnostic biomarker of CRC.  </div> Biomarker, Blood Platelets, Circular RNA, Colorectal Cancer, Polyps. 368 376 http://rbmb.net/browse.php?a_code=A-10-1548-2&slc_lang=en&sid=1 Hossein Razzaghi 100319475328460020756 100319475328460020756 No Student Research Committee, Baqiyatallah University of Medical Sciences, Tehran, Iran. Mohammad Heiat 100319475328460020757 100319475328460020757 No Baqiyatallah Research Center for Gastroenterology and Liver Diseases (BRCGL), Clinical Sciences Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran. Ahmad Khoncheh 100319475328460020758 100319475328460020758 No Baqiyatallah Research Center for Gastroenterology and Liver Diseases (BRCGL), Clinical Sciences Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran. Mohammad Ali Abyazi 100319475328460020759 100319475328460020759 No Baqiyatallah Research Center for Gastroenterology and Liver Diseases (BRCGL), Clinical Sciences Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran. Majid Zaki-Dizaji majid.zaki-dizaji@gmail.com. 100319475328460020760 100319475328460020760 Yes Human Genetics Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.