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CTCs detection through CK-19 expression

CTCs detection in peripheral blood

through the quantification of cytokeratin 19 (CK-19) expression using RT-qPCR

  • Gene: CK19
  • Methodology: RT-qPCR 
  • Instrumentation: LightCycler 2.0 (IVD, Roche Diagnostics)
  • Analytical characteristics: exceptional analytical sensitivity and specificity
  • Requested sample: 20mL peripheral blood (EDTA) - pre-, during or post-therapy
  • Cost: please contact Dr E.Lianidou (lianidou@chem.uoa.gr)


  • Publications:
  1. Stathopoulou A, et al, A highly specific real-time RT-PCR method for the quantitative determination of CK-19 mRNA positive cells in peripheral blood of patients with operable breast cancer. Int J Cancer. 2006 Oct 1;119(7):1654-9.
  2. Stathopoulou A, et al, Real-time quantification of CK-19 mRNA-positive cells in peripheral blood of breast cancer patients using the lightcycler system. Clin Cancer Res. 2003 Nov 1;9(14):5145-51
  3. Strati A, Markou A, Parisi C, Politaki E, Mavroudis D, Georgoulias V, Lianidou E. Gene expression profile of circulating tumor cells in breast cancer by RT-qPCR. BMC Cancer. 2011 Oct 4;11:422.


  • Clinical importance:
  1.  Xenidis N, Ignatiadis M, Apostolaki S, Perraki M, Kalbakis K, Agelaki S, Stathopoulos EN, Chlouverakis G, Lianidou E, Kakolyris S, Georgoulias V, Mavroudis D. Cytokeratin-19 mRNA-positive circulating tumor cells after adjuvant chemotherapy in patients with early breast cancer. J Clin Oncol. 2009 May 1;27(13):2177-84.
  2. Ignatiadis M, Kallergi G, Ntoulia M, Perraki M, Apostolaki S, Kafousi M, Chlouverakis G, Stathopoulos E, Lianidou E, Georgoulias V, Mavroudis D. Prognostic value of the molecular detection of circulating tumor cells using a multimarker reverse transcription-PCR assay for cytokeratin 19, mammaglobin A, and HER2 in early breast cancer. Clin Cancer Res. 2008 May 1;14(9):2593-600.
  3. Ignatiadis M, Perraki M, Apostolaki S, Politaki E, Xenidis N, Kafousi M, Stathopoulos E, Lianidou E, Sotiriou C, Georgoulias V, Mavroudis D. Molecular detection and prognostic value of circulating cytokeratin-19 messenger RNA-positive and HER2 messenger RNA-positive cells in the peripheral blood of women with early-stage breast cancer. Clin Breast Cancer. 2007 Dec;7(11):883-9.
  4. Ignatiadis M, Xenidis N, Perraki M, Apostolaki S, Politaki E, Kafousi M, Stathopoulos EN, Stathopoulou A, Lianidou E, Chlouverakis G, Sotiriou C, Georgoulias V, Mavroudis D. Different prognostic value of cytokeratin-19 mRNA positive circulating tumor cells according to estrogen receptor and HER2 status in early-stage breast cancer. J Clin Oncol. 2007 Nov 20;25(33):5194-202.
  5. Xenidis N, Perraki M, Kafousi M, Apostolaki S, Bolonaki I, Stathopoulou A, Kalbakis K, Androulakis N, Kouroussis C, Pallis T, Christophylakis C, Argyraki K, Lianidou ES, Stathopoulos S, Georgoulias V, Mavroudis D. Predictive and prognostic value of peripheral blood cytokeratin-19 mRNA-positive cells detected by real-time polymerase chain reaction in node-negative breast cancer patients. J Clin Oncol. 2006 Aug 10;24(23):3756-62.