Unbiased quantitative assessment of Her-2 expression of circulating tumor cells in patients with metastatic and non-metastatic breast cancer.
Ann Oncol
; 24(5): 1231-8, 2013 May.
Article
em En
| MEDLINE
| ID: mdl-23275633
ABSTRACT
Background Circulating tumor cells (CTCs) can provide the basis for a liquid biopsy and may guide the use of targeted therapies. We report on unbiased quantification of Her-2 protein expression of CTCs. Patients and methods Her-2 assessment of CTCs was carried out using the CellSearch(®) system in 103 metastatic (M1) and 88 non-metastatic (M0) breast-cancer patients. Expression of Her-2 on CTCs was determined by a manual review and an automated algorithm using Her-2- fluorescein isothiocyanate (FITC) fluorescence of leukocytes to determine the Her-2-expression threshold in each sample. Results Her-2 expression of CTCs varied greatly within and among patients compared with Her-2 expression of leukocytes. In M1 patients, a threshold of 75% of Her-2 positive CTCs in patients with ≥5 CTCs was set. Applying this threshold, 9% of M1 patients with Her-2-negative primary tumors had Her-2-positive CTC status and 29% of M1 patients with Her-2-positive primary tumors had Her-2-negative CTC status. No Her-2 discrepancy was observed between CTCs and primary tumors in M0 patients. Conclusions Our findings demonstrate that Her-2 expression is heterogeneous among CTCs within each patient. We show the feasibility of unbiased quantitative and reproducible assessment of treatment targets on CTCs, opening a path towards personalized treatment.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
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Receptor ErbB-2
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Células Neoplásicas Circulantes
Tipo de estudo:
Clinical_trials
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Guideline
Limite:
Female
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Humans
Idioma:
En
Revista:
Ann Oncol
Assunto da revista:
NEOPLASIAS
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Holanda