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Ujiie, Daisuke; Matsumoto, Takuro; Endo, Eisei; Okayama, Hirokazu; Fujita, Shotaro; Kanke, Yasuyuki; Watanabe, Yohei; Hanayama, Hiroyuki; Hayase, Suguru; Saze, Zenichirou; Ohki, Shinji; Kono, Koji
Esophagus : official journal of the Japan Esophageal Society, 07/2021, Volume: 18, Issue: 3Journal Article
Background Circulating tumor cells (CTCs) are known to be a systemic process of malignant progression of cancer cells and there is a possibility that analysis for CTCs as a liquid biopsy become predictive or prognostic tools for cancer patients. Methods In the present study with the novel CTCs detection system (Celsee system ® ), we performed quantitative and qualitative analysis of CTCs in patients with esophageal squamous cell carcinoma (ESCC) receiving neoadjuvant chemotherapy (NAC) with 5FU + CDDP regimen. CTCs are defined as having both DAPI positive and CD45 negative. Vimentin-positive CTCs were defined as mesenchymal-type CTCs (M-CTCs), while epithelial-type CTCs (E-CTCs) were only positive for pan-cytokeratin. Results At the baseline, there are detectable amounts of CTCs in all patients ( n = 30) at all stages, and there were no significant differences of total CTCs, E-CTCs, or M-CTCs numbers between stages. Of importance, among total CTCs, M-CTCs are more dominant than E-CTCs in number. Also, there was no significant change of detectable amounts and phenotype of CTCs before and after NAC ( n = 24). Of note, early recurrent group indicated that there was an elevated total CTCs number before NAC and an increased M-CTCs after NAC in comparison to those in non-recurrent group. Conclusions Quantitative and qualitative analysis of CTCs may provide useful complementary predictive and prognostic information in ESCC.
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