Abstract
Background
The detection of circulating tumor cells (CTCs) is of prognostic significance in several tumor types. The present study evaluated the detection and the clinical relevance of CK19mRNA(+) CTCs in patients with advanced/metastatic non-small cell lung cancer before and after front-line chemotherapy.
Patients and methods
Peripheral blood was obtained from 642 patients with treatment-naïve unresectable stage IIIB and IV non-small cell lung cancer and from 455 patients after the completion of 1st line chemotherapy. RNA was extracted from peripheral blood mononuclear cells and the detection of CK19mRNA-positive cells was performed using a quantitative PCR assay.
Results
Based on the detection limit of the assay, 167 (26.0%) patients had detectable CK19mRNA(+) CTCs at baseline. The detection of CK19mRNA(+) CTCs before treatment was not associated with the clinical outcome, but their detection at the end of chemotherapy was associated with significantly decreased PFS and OS [PFS: 2.6 vs 3.8 months (p = 0.008); OS: 5.7 vs 10.0 months (p = 0.006) for CK19mRNA(+) vs CK19mRNA(−) patients, respectively]. Multivariate analysis revealed that the detection of CK19mRNA(+) CTCs both before and after chemotherapy emerged as an independent factor associated with reduced PFS (HR: 1.778; p < 0.001) and OS (HR: 1.608; p = 0.001).
Conclusion
The detection of peripheral blood CK19mRNA(+) CTCs before and after the completion of front-line chemotherapy is an adverse prognostic factor associated with poor clinical outcome in patients with stage IIIB/IV non-small cell lung cancer.
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We acknowledge the assistance of the scientific secretary Vasso Athanasaki in the preparation of this manuscript.
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This work was partly supported by research grants from the Cretan Association for Biomedical Research (CABR) and the Hellenic Society of Medical Oncology (HeSMO).
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Milaki G, Messaritakis I, Koinis F, Kotsakis A, Apostolaki S, Dermitzaki EK, Perraki M, Hatzidaki D, and Georgoulias V declare that they have no conflict of interest.
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This article does not contain any studies with human participants or animals performed by any of the authors.
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Informed consent was obtained from all individual participants included in the study.
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Milaki, G., Messaritakis, I., Koinis, F. et al. Prognostic value of chemotherapy-resistant CK19mRNA-positive circulating tumor cells in patients with advanced/metastatic non-small cell lung cancer. Cancer Chemother Pharmacol 80, 101–108 (2017). https://doi.org/10.1007/s00280-017-3339-0
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DOI: https://doi.org/10.1007/s00280-017-3339-0