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01-04-2014 | Original Article

Elimination of EGFR-expressing circulating tumor cells in patients with metastatic breast cancer treated with gefitinib

Authors: Antonia Kalykaki, Sofia Agelaki, Galatea Kallergi, Alexandros Xyrafas, Dimitris Mavroudis, Vassilis Georgoulias

Published in: Cancer Chemotherapy and Pharmacology | Issue 4/2014

Abstract

Purpose

The purpose of the study is to evaluate the effect of gefitinib, an anti-EGFR TKI on circulating tumor cells (CTCs) in patients with metastatic breast cancer (MBC).

Methods

Seventeen patients with MBC with detectable CTCs after the completion of prior treatment received gefitinib 250 mg/day p.o. CTCs were monitored by immunofluorescence microscopy after double staining with anti-cytokeratin (A45-B/B3) and either anti-CD45 or anti-EGFR antibodies.

Results

A median reduction of 96.4 and 94.1 % in CTC count was observed in 11 (64.7 %) and 12 (70.6 %) of patients after the first and the second treatment cycles, respectively. Total CTC numbers declined by 73 and 44 % after the first and second treatment cycles, respectively. In nine patients with EGFR(+)/CK(+) CTCs, gefitinib resulted in a reduction of both EGFR(+) and EGFR(−) CTCs, and after the third course, most detected CTCs were EGFR(−). In two patients, with a sustained decrease in CTC numbers, a PFS of 16.0 and 19.0 months was observed and in one of them, it was associated with clinical objective response.

Conclusion

Treatment-resistant CTCs could be eliminated by gefitinib in MBC, and EGFR expression on CTCs merits further validation as a potential biomarker for specific and effective targeting of CTCs.

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Title: Elimination of EGFR-expressing circulating tumor cells in patients with metastatic breast cancer treated with gefitinib
Authors: Antonia Kalykaki
Sofia Agelaki
Galatea Kallergi
Alexandros Xyrafas
Dimitris Mavroudis
Vassilis Georgoulias
Publication date: 01-04-2014
Publisher: Springer Berlin Heidelberg
Published in: Cancer Chemotherapy and Pharmacology / Issue 4/2014
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI: https://doi.org/10.1007/s00280-014-2387-y

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Purpose

Methods

Results

Conclusion

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