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Imaging cytometry for counting circulating tumor cells: comparative analysis of the CellSearch vs ImageStream systems
Author(s) -
LópezRiquelme Natividad,
Minguela Alfredo,
VillarPermuy Flori,
Ciprian Daniel,
Castillejo Adela,
ÁlvarezLópez MaríaRocio,
Soto JoséLuis
Publication year - 2013
Publication title -
apmis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.909
H-Index - 88
eISSN - 1600-0463
pISSN - 0903-4641
DOI - 10.1111/apm.12061
Subject(s) - enumeration , circulating tumor cell , flow cytometry , immunomagnetic separation , cytometry , pathology , medicine , biology , immunology , cancer , microbiology and biotechnology , mathematics , combinatorics , metastasis
Circulating tumor cell ( CTC ) enumeration is important clinically for identifying prognostic and predictive factors in patients with solid cancers. The CellSearch device (Veridex) is an immunomagnetic CTC selection and enumeration system used in clinical practice. The ImageStream (Amnis) combines the strengths of flow cytometry and fluorescent microscopy in a single platform and has potential application for CTC counting. The performance in CTC enumeration was compared between the ImageStream and CellSearch systems. Various numbers of PANC ‐1 tumor cells were spiked into 7.5 mL of peripheral blood from a healthy donor. Before cell analysis by the ImageStream, tumor cell enrichment was performed by immunomagnetic selection with anti‐Ep PCAM . Anti‐ CD 45 and anti‐ CK markers were used to discriminate between tumor cells and leukocytes. The ratios of tumor cells recovered from each dilution were calculated for both methods. The Wilcoxon rank test was applied to compare the results of the two methods and the reference value. The results of the two tested methods differed significantly from the reference value, but did not differ between them. Nevertheless, lower level of trueness and precision was observed in ImageStream when fewer numbers of CTC s were analyzed. Our results suggest that ImageStream platform for CTC enumeration has a potential value for the early diagnosis of disseminated disease, but needs an improvement of precision for the enumeration of low number of CTC .