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Logo of bmccancBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Cancer
BMC Cancer. 2012; 12: 114.
Published online Mar 23, 2012. doi:  10.1186/1471-2407-12-114
PMCID: PMC3364860
Mesenchymal and stemness circulating tumor cells in early breast cancer diagnosis
Guislaine Barrière,1 Alain Riouallon,2 Joël Renaudie,2 Michel Tartary,1 and Michel Rigaudcorresponding author1
1Astralab clinical laboratory, 7-11 Avenue de Lattre de Tassigny, 87000 Limoges, France
2Department of gynecology and surgery, Clinique du Colombier, 92 avenue Albert Thomas, 87100 Limoges, France
corresponding authorCorresponding author.
Guislaine Barrière: guislainebarriere/at/; Alain Riouallon: riouallon/at/; Joël Renaudie: renjo/at/; Michel Tartary: michel.tartary/at/; Michel Rigaud: rigaud.michel/at/
Received August 2, 2011; Accepted March 23, 2012.
Epithelial mesenchymal transition (EMT) is a crucial event likely involved in dissemination of epithelial cancer cells. This process enables them to acquire migratory/invasive properties, contributing to tumor and metastatic spread. To know if this event is an early one in breast cancer, we developed a clinical trial. The aim of this protocol was to detect circulating tumor cells endowed with mesenchymal and/or stemness characteristics, at the time of initial diagnosis. Breast cancer patients (n = 61), without visceral or bone metastasis were enrolled and analysis of these dedifferentiated circulating tumor cells (ddCTC) was realized.
AdnaGen method was used for enrichment cell selection. Then, ddCTC were characterized by RT-PCR study of the following genes: PI3Kα, Akt-2, Twist1 (EMT markers) and ALDH1, Bmi1 and CD44 (stemness indicators).
Among the studied primary breast cancer cohort, presence of ddCTC was detected in 39% of cases. This positivity is independant from tumor clinicopathological factors apart from the lymph node status.
Our data uniquely demonstrated that in vivo EMT occurs in the primary tumors and is associated with an enhanced ability of tumor cells to intravasate in the early phase of cancer disease. These results suggest that analysis of circulating tumor cells focused on cells showing mesenchymal or stemness characteristics might facilitate assessment of new drugs in clinical trials.
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