HER2-positive circulating tumor cells in breast cancer

Michail Ignatiadis, Françoise Rothé, Carole Chaboteaux, Virginie Durbecq, Ghizlane Rouas, Carmen Criscitiello, Jessica Metallo, Naima Kheddoumi, Sandeep K. Singhal, Stefan Michiels, Isabelle Veys, José Rossari, Denis Larsimont, Birgit Carly, Marta Pestrin, Silvia Bessi, Frédéric Buxant, Fabienne Liebens, Martine Piccart, Christos Sotiriou

Research output: Contribution to journalArticlepeer-review


Purpose: Circulating Tumor Cells (CTCs) detection and phenotyping are currently evaluated in Breast Cancer (BC). Tumor cell dissemination has been suggested to occur early in BC progression. To interrogate dissemination in BC, we studied CTCs and HER2 expression on CTCs across the spectrum of BC staging. Methods: Spiking experiments with 6 BC cell lines were performed and blood samples from healthy women and women with BC were analyzed for HER2-positive CTCs using the CellSearch®. Results: Based on BC cell lines experiments, HER2-positive CTCs were defined as CTCs with HER2 immunofluoresence intensity that was at least 2.5 times higher than the background. No HER2-positive CTC was detected in 42 women without BC (95% confidence interval (CI) 0-8.4%) whereas 4.1% (95%CI 1.4-11.4%) of 73 patients with ductal/lobular carcinoma in situ (DCIS/LCIS) had 1 HER2-positive CTC/22.5 mL, 7.9%, (95%CI 4.1-14.9%) of 101 women with non metastatic (M0) BC had ≥1 HER2-positive CTC/22.5 mL (median 1 cell, range 1-3 cells) and 35.9% (95%CI 22.7-51.9%) of 39 patients with metastatic BC had ≥1 HER2-positive CTC/7.5 mL (median 1.5 cells, range 1-42 cells). In CTC-positive women with DCIS/LCIS or M0 BC, HER2-positive CTCs were more commonly detected in HER2-positive (5 of 5 women) than HER2-negative BC (5 of 12 women) (p = 0.03). Conclusion: HER2-positive CTCs were detected in DCIS/LCIS or M0 BC irrespective of the primary tumor HER2 status. Nevertheless, their presence was more common in women with HER2-positive disease. Monitoring of HER2 expression on CTCs might be useful in trials with anti-HER2 therapies.

Original languageEnglish
Article numbere15624
JournalPLoS One
Issue number1
Publication statusPublished - 2011

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)


Dive into the research topics of 'HER2-positive circulating tumor cells in breast cancer'. Together they form a unique fingerprint.

Cite this