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Published in: Cancer Chemotherapy and Pharmacology 4/2008

01-04-2008 | Original Article

Evaluation of ER and Ki-67 proliferation index as prognostic factors for survival following neoadjuvant chemotherapy with doxorubicin/docetaxel for locally advanced breast cancer

Authors: J. Lee, Y. H. Im, S. H. Lee, E. Y. Cho, Y. L. Choi, Y. H. Ko, J. H. Kim, S. J. Nam, H. J. Kim, J. S. Ahn, Y. S. Park, H. Y. Lim, B. K. Han, J. H. Yang

Published in: Cancer Chemotherapy and Pharmacology | Issue 4/2008

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Abstract

Background

The aim of the study was to identify reliable predictive biological markers for treatment outcome following neoadjuvant adriamycin/docetaxel (AT) chemotherapy in locally advanced breast cancer patients.

Materials and methods

This study was a phase II study on AT neoadjuvant chemotherapy in locally advanced breast cancer patients. Patients received 50 mg/m2 of doxorubicin intravenously (IV) over 15 min followed by docetaxel 75 mg/m2 infused over 1 h, repeated every 3 weeks for three cycles. Surgery was performed within 3–4 weeks following the last cycle of chemotherapy. We analyzed the pre-treatment and post-treatment expression levels of ER, PgR, HER-2, Ki-67 proliferation index, and p53 and examined the correlation between the markers and clinical parameters with treatment response, overall survival and relapse-free survival following neoadjuvant treatment.

Results

From July 2001 to September 2004, 61 patients were enrolled. The meaningful parameters adversely influencing survival were post-treatment ER(−) status (= 0.013) and post-treatment Ki-67 index above 1.0% (= 0.013). At the multivariate level, the post-treatment Ki-67 proliferation index ≤ 1.0 was the only meaningful prognostic factor for better survival (= 0.033). Notably, tumors with Ki-67 index ≤ 1.0 were more likely to express ER with statistical significance (= 0.002). Tumors with ER(+) and Ki-67 index ≤ 1.0 showed the highest survival rate, followed by ER(+) and Ki-67 index > 1.0%, ER(−) and Ki-67 ≤ 1.0%, and ER(−) and Ki-67 > 1.0% with the worst survival (= 0.033).

Conclusion

Collectively, post-treatment ER status and Ki-67 proliferation index were prognostic of overall survival following neoadjuvant AT chemotherapy.
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Metadata
Title
Evaluation of ER and Ki-67 proliferation index as prognostic factors for survival following neoadjuvant chemotherapy with doxorubicin/docetaxel for locally advanced breast cancer
Authors
J. Lee
Y. H. Im
S. H. Lee
E. Y. Cho
Y. L. Choi
Y. H. Ko
J. H. Kim
S. J. Nam
H. J. Kim
J. S. Ahn
Y. S. Park
H. Y. Lim
B. K. Han
J. H. Yang
Publication date
01-04-2008
Publisher
Springer-Verlag
Published in
Cancer Chemotherapy and Pharmacology / Issue 4/2008
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-007-0506-8

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