High‑throughput and continuous flow isolation of rare circulating tumor cells and clusters in gastric cancer from human whole blood samples using electromagnetic vibration‑based filtration

Xiang,An; Xue,Mei; Ren,Fengling; Wang,Li; Ye,Zichen; Li,Da; Ji,Qifeng; Ji,Gang; Lu,Zifan

doi:10.3892/or.2020.7567

High‑throughput and continuous flow isolation of rare circulating tumor cells and clusters in gastric cancer from human whole blood samples using electromagnetic vibration‑based filtration

Authors:
- An Xiang
- Mei Xue
- Fengling Ren
- Li Wang
- Zichen Ye
- Da Li
- Qifeng Ji
- Gang Ji
- Zifan Lu
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Affiliations: State Key Laboratory of Cancer Biology, Department of Biopharmaceutics, School of Pharmacy, Air Force Medical University, Xi'an, Shaanxi 710032, P.R. China, Center for Translational Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China, School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710061, P.R. China, Xijing Hospital of Digestive Diseases, Xijing Hospital, Air Force Medical University, Xi'an, Shaanxi 710032, P.R. China
Published online on: March 30, 2020 https://doi.org/10.3892/or.2020.7567
Pages: 1975-1985
Copyright: © Xiang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Circulating tumor cells (CTCs) or CTC clusters are considered as suitable and relevant targets for liquid biopsy as they more accurately indicate cancer progression, the therapeutic effects of treatment and allows for monitoring of cancer metastasis in real‑time. Among the various methods for isolating CTCs, size‑based filtration is one of the most convenient methods. However, cell clogging makes the filtration process less efficient. In the present study, an electromagnetic vibration‑based filtration (eVBF) device was developed that efficiently isolated rare CTCs and CTC clusters from clinical blood samples of patients with gastric cancer. Using human blood samples spiked with human gastric cancer cells, the parameters of this device such as vibrating amplitude and flow rate were optimized. Putative CTCs were detected using a conventional filtration method and the eVBF device from the peripheral blood samples of patients with gastric cancer. Continuous flow isolation of CTCs was evaluated by a simulated blood flow system. The eVBF device utilized the electromagnetic force to generate a periodic vibration that prevented the cell clogging and improved the filtering efficiency. The optimized eVBF device with the high‑amplitude vibration exhibited a recovery efficiency of 80‑90% from whole blood samples spiked with 100 or 1,000 gastric cancer cells per ml. Using the eVBF device, CTCs were detected in 100% of patients (10/10) with gastric cancer, and the positive detection rate of the eVBF device was 30% higher compared with the conventional filtration method. Furthermore, CTC clusters were detected in 40% (4/10) of CTC‑positive patient samples, and the integrity of CTC clusters was preserved using the eVBF device. The eVBF device allowed for high‑throughput (1 ml/min) and continuous flow isolation of CTCs without the addition of any antibodies, any chemical reagents or any pretreatment processes. Thus, the eVBF device provides an efficient tool for isolating rare CTCs and CTC clusters from patients with cancer, highlighting its potential for use in cancer diagnosis, treatment and cancer biology research.

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