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Published in: Breast Cancer Research 2/2012

Open Access 01-04-2012 | Research article

Effects of cyclin D1 gene amplification and protein expression on time to recurrence in postmenopausal breast cancer patients treated with anastrozole or tamoxifen: a TransATAC study

Authors: Katja Lundgren, Matthew Brown, Silvia Pineda, Jack Cuzick, Janine Salter, Lila Zabaglo, Anthony Howell, Mitch Dowsett, Göran Landberg, the TransATAC investigators

Published in: Breast Cancer Research | Issue 2/2012

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Abstract

Introduction

Gene amplification of CCND1 is observed in a subgroup of breast cancers with poor prognosis, whereas overexpression of the protein cyclin D1 has been linked to both worse and better clinical outcome. CCND1 amplification and protein overexpression have also been associated with resistance to treatment with tamoxifen or even to a potentially detrimental effect of tamoxifen.

Methods

To clarify these challenging and partly contrasting treatment predictive and prognostic links for cyclin D1 we analysed a large cohort of postmenopausal breast cancer patients randomised to receive either adjuvant anastrozole or tamoxifen, as part of the Arimidex, Tamoxifen, Alone or in Combination (ATAC) trial. The CCND1 amplification status and protein expression of cyclin D1 were assessed by chromogenic in situ hybridisation and immunohistochemistry, respectively, in 1,155 postmenopausal, oestrogen-receptor-positive breast cancer patients included in the TransATAC substudy.

Results

Amplification of CCND1 was observed in 8.7% of the tumours and was associated with increased risk of disease recurrence (hazard ratio = 1.61; 95% confidence interval, 1.08 to 2.41) after adjustment for other clinicopathological parameters. In contrast, nuclear expression of cyclin D1 protein was associated with decreased recurrence rate (hazard ratio = 0.6; 95% confidence interval, 0.39 to 0.92). The intensity of nuclear or cytoplasmic expression was not of prognostic value. There was no significant interaction between cyclin D1 status and treatment efficacy, ruling out any major detrimental effect of tamoxifen in CCND1-amplified postmenopausal breast cancer.

Conclusions

In summary, CCND1 amplification and low nuclear expression of cyclin D1 predicted poor clinical outcome in postmenopausal breast cancer patients treated with either anastrozole or tamoxifen.

Trial Registration

Current Controlled Trials ISRCTN18233230.
Appendix
Available only for authorised users
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Metadata
Title
Effects of cyclin D1 gene amplification and protein expression on time to recurrence in postmenopausal breast cancer patients treated with anastrozole or tamoxifen: a TransATAC study
Authors
Katja Lundgren
Matthew Brown
Silvia Pineda
Jack Cuzick
Janine Salter
Lila Zabaglo
Anthony Howell
Mitch Dowsett
Göran Landberg
the TransATAC investigators
Publication date
01-04-2012
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 2/2012
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr3161

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