Abstract
Purpose
Timing and magnitude of blood release of circulating tumour cells (CTC) and circulating tumour microemboli (CTM) from primary solid cancers are uncertain. We investigated prevalence and number of CTC and CTM at diagnosis of advanced non-small cell lung cancer (NSCLC).
Methods
Twenty-eight consecutive patients with suspected stage III–IV lung cancer gave consent to provide 15 mL of peripheral blood soon before diagnostic CT-guided fine-needle aspiration biopsy (FNAB). CTC and CTM (clusters of ≥3 CTC) were isolated by cell size filtration (ScreenCell), identified and counted by cytopathologists using morphometric criteria and (in 6 cases) immunostained for vimentin.
Results
FNAB demonstrated NSCLC in 26 cases. At least one CTC/3 mL blood (mean 6.8 ± 3.7) was detected in 17 (65 %) and one CTM (mean 4.5 ± 3.3) in 15 (58 %) of 26 NSCLC cases. No correlation between number of CTC or CTM and tumour type or stage was observed. Neoplastic cells from both FNA and CTC/CTM were positive for vimentin but heterogeneously.
Conclusions
CTC can be detected in two-thirds and CTM in more than half of patients with advanced NSCLC at diagnosis. Reasons underlying lack of CTC and CTM in some advanced lung cancers deserve further investigations.
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Acknowledgments
This work was supported by Ente CR Firenze and Regione Toscana (“CYTOPEM” POR CREO FESR 2007–2013).
Funding
This study was funded by Ente CR Firenze and Regione Toscana (Grant “CYTOPEM” POR CREO FESR 2007–2013).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Mascalchi, M., Falchini, M., Maddau, C. et al. Prevalence and number of circulating tumour cells and microemboli at diagnosis of advanced NSCLC. J Cancer Res Clin Oncol 142, 195–200 (2016). https://doi.org/10.1007/s00432-015-2021-3
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DOI: https://doi.org/10.1007/s00432-015-2021-3