Clinical & Experimental Metastasis

, Volume 22, Issue 1, pp 39–46

Chemokine receptor CXCR4 expression in breast cancer as a potential predictive marker of isolated tumor cells in bone marrow

  • Neslihan Cabioglu
  • Aysegul Sahin
  • Michele Doucet
  • Ekrem Yavuz
  • Abdullah Igci
  • Engin O.Yildirim
  • Esin Aktas
  • Sema Bilgic
  • Bayram Kiran
  • Gunnur Deniz
  • Janet E. Price
Article

Abstract

Interactions between the CXCR4 chemokine receptor in breast cancer cells and the ligand CXCL12/SDF-1α are thought to play an important role in breast cancer metastases. In this pilot study, CXCR4 expression along with other biomarkers including HER2-neu and EGFR, were measured in primary tumor samples of patients with operable breast cancer to test whether any of these biomarkers alone and in combination could indicate breast cancer with high likelihood of metastasizing to bone marrow. Cytokeratin (CK) positive cells in bone marrow were identified by flow-cytometry following enrichment with CK 7/8 antibody-coupled magnetic beads. Primary tumors (n = 18) were stained with specific antibodies for CXCR4, HER2-neu, EGFR, and PCNA using an indirect avidin–biotin horseradish peroxidase method. The majority of the patients had T2/T3 tumors (72%), or lymph node involvement (67%) as pathologic characteristics that were more indicative of high-risk breast cancer. High CXCR4 cytoplasmic expression was found in 7 of 18 patients (39%), whereas 6 of 18 patients (33%) were found to have CK positivity in bone marrow. The median number of CK+ cells was 236 (range, 20–847) per 5 × 104 enriched BM cells. The presence of CK+ cells in bone marrow was found to be associated with increased expression of CXCR4 alone or in addition to EGFR and/or HER2-neu expression (P = 0.013, P = 0.005, and P = 0.025, respectively) in primary tumors. Furthermore, three patients with high CK positivity (>236 CK+ per 5 × 104 enriched bone marrow cells) in bone marrow exclusively expressed high levels of CXCR4 with EGFR/HER2-neu (P = 0.001). Our data suggest that high CXCR4 expression in breast cancer may be a potential marker in predicting isolated tumor cells in bone marrow. CXCR4 coexpression with EGFR/HER2-neu might further predict a particular subset of patients with high CK positivity in bone marrow.

Keywords

bone marrow micrometastases breast cancer chemokine receptors CXCR4 EGFR HER2/neu 

Abbreviations

BM

bone marrow

CK

cytokeratin

EGFR

epidermal growth factor receptor

ER

estrogen receptor

HG

histologic grade

ITC

isolated tumor cell

PBS

phosphate buffered saline

PCNA

proliferating cell nuclear antigen

PR

progesteron receptor

TNM

tumor node metastasis

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Copyright information

© Springer 2005

Authors and Affiliations

  • Neslihan Cabioglu
    • 1
  • Aysegul Sahin
    • 2
  • Michele Doucet
    • 1
  • Ekrem Yavuz
    • 3
  • Abdullah Igci
    • 4
  • Engin O.Yildirim
    • 5
  • Esin Aktas
    • 5
  • Sema Bilgic
    • 5
  • Bayram Kiran
    • 5
  • Gunnur Deniz
    • 5
  • Janet E. Price
    • 1
  1. 1.Department of Cancer BiologyThe University of Texas M.D. Anderson Cancer CenterHoustonUSA
  2. 2.Department of PathologyThe University of Texas M.D. Anderson Cancer CenterHoustonUSA
  3. 3.Department of PathologyIstanbul Faculty of MedicineIstanbulTurkey
  4. 4.Department of General SurgeryIstanbul Faculty of MedicineIstanbulTurkey
  5. 5.Institute of Experimental Medical ResearchInstanbul UniversityIstanbulTurkey

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