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This article is part of the supplement: IX Madrid Breast Cancer Conference

Poster presentation

Prognostic value of a high level of circulating endothelial cells in patients with HER2-recurrent or metastatic breast cancer treated with bevacizumab in combination with paclitaxel and gemcitabine as first-line therapy

L Manso1*, E Ciruelos1, M Codes2, J De la Haba3, A Galan4, J Baena5, A Jaen6, M Gil7, A Murias8, I Blancas9, E Gonzalez10, D Perez11, JL Bayo12, J Mel13, E Garcia-Martinez14, R Cubedo15 and J Salvador16

  • * Corresponding author: L Manso

Author Affiliations

1 Hospital 12 de Octubre, Madrid, Spain

2 Hospital Virgen Macarena, Sevilla, Spain

3 Hospital Reina Sofía, Córdoba, Spain

4 Hospital de Sagunto, Spain

5 Hospital Puerta del Mar, Cádiz, Spain

6 Hospital de Jaen, Spain

7 ICO, Bellvitge, Spain

8 Hospital Insular, Las Palmas de Gran Canaria, Spain

9 Hospital San Cecilio, Granada, Spain

10 Hospital Virgen de las Nieves, Granada, Spain

11 Hospital Costa del Sol, Marbella, Spain

12 Hospital Juan Ramón Jimenez, Huelva, Spain

13 Hospital Xeral-Calde, Lugo, Spain

14 Hospital Morales Messeguer, Murcia, Spain

15 Hospital Puerta de Hierro, Madrid, Spain

16 Hospital Universitario de Valme, Sevilla, Spain

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Breast Cancer Research 2011, 13(Suppl 2):P4  doi:10.1186/bcr3025


The electronic version of this article is the complete one and can be found online at: http://breast-cancer-research.com/content/13/S2/P4


Published:16 November 2011

© 2011 Manso et al.

Introduction

Circulating endothelial cells (CECs) are shed from vessels and enter the circulation reflecting endothelial damage. Increased numbers of CECs have been documented in cancer, and appear to correlate with progression of the tumor. Bevacizumab (B) in combination with CT improves progression-free survival (PFS) of first-line treatments and may modify tumor cell intravasation and CEC/CTC levels.

Methods

Patients received B (10 mg/kg/2 weeks) combined with paclitaxel (P) 150 mg/m2 and gemcitabine (G) 2,000 mg/m2 days 1 and 15 with a cycle each 28 days of therapy, until disease progression, unacceptable toxicity or withdrawal. CTC/CECs were measured in 7.5 ml blood at baseline and after the first cycle of treatment. Enumeration was performed by the CellSearch System (Veridex).

Results

Median of follow-up was 16.28 months. Baseline CECs were available for 31 patients. Median value of baseline CECs was 130 (minimum 4 to maximum 1,407) and 60.3 (minimum 0 to maximum 349) in the second determination, P = 0.02. High levels of baseline CECs ≥200 were associated with lower PFS of 8.2 months (95% CI = 0.6 to 10.8) compared with those with <200, PFS 16.9 months (95% CI = 8.78 to NA), P = 0.003. See Figure 1. No difference was observed in OS. Fourteen patients (74%) that had stable disease/partial response decreased or maintained their CEC value. Baseline CTCs ≥5 was associated with a median PFS of 15.2 months (95% CI = 7.6 to 16.9). Twenty-two patients (92%) that had stable disease/partial response decreased or maintained their CTC value. The CTC level was not correlated with the CEC level, P = 0.74.

Conclusion

Our study suggests significant correlations between high levels of baseline CECs and poor prognosis. Addiction of B to first-line CT was related to a high reduction of CEC and CTC count.