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Expression of Cyclin D1 protein in residual tumor after neoadjuvant chemotherapy for breast cancer

S L Villegas, S Darb-Esfahani, G Von Minckwitz, Jens Huober, K Weber, F Marmé, J Furlanetto, C Schem, B M Pfitzner, B Lederer, K Engels, S Kümmel, V Müller, K Mehta, C Denkert & S Loibl

abstract

PURPOSE
Hormone receptor (HR)-positive breast cancer (BC) shows a poor response to neoadjuvant chemotherapy (NACT). New treatment targets like the Cyclin D1-CDK4/CDK6 complex are promising adjuvant/post-neoadjuvant therapeutic strategies. Evaluating Cyclin D1 overexpression in residual tumor could recognize those patients that benefit most from such post-neoadjuvant treatment. In this study, we determined Cyclin D1 expression in residual BC after NACT. Secondary aims were to correlate Cyclin D1 expression levels with clinicopathological parameters and to assess its prognostic value after NACT.

METHODS
We retrospectively assessed the nuclear expression of Cyclin D1 on tissue microarrays with residual tumor from 284 patients treated in the neoadjuvant GeparTrio (n = 186) and GeparQuattro (n = 98) trials. Evaluation was performed with a standardized immunoreactive score (IRS) after selecting a cut-off value.

RESULTS
A high expression level (IRS ≥ 6) of Cyclin D1 was found in 37.3% of the assessed specimens. An increased Cyclin D1 expression was observed in HR-positive tumors, compared to HR-negative tumors (p = 0.02). Low Cyclin D1 levels correlated with clinical tumor stage 1-3 (p = 0.03). Among patients with HR-positive/Her2-negative tumors and high Cyclin D1 expression, a better disease-free survival (DFS) was graphically suggested, but not significant (p = 0.21).

CONCLUSION
Our study demonstrates a measurable nuclear expression of Cyclin D1 in post-neoadjuvant residual tumor tissue of HR-positive BC. Cyclin D1 expression was not prognostic for DFS after NACT. Our results and defined cut-off suggest that the marker can be used to stratify tumors according to protein expression levels. Based on this, a prospective evaluation is currently performed in the ongoing Penelope-B trial.
   
citation Villegas S L, Darb-Esfahani S, von Minckwitz G, Huober J, Weber K, Marmé F, Furlanetto J, Schem C, Pfitzner B M, Lederer B, Engels K, Kümmel S, Müller V, Mehta K, Denkert C, Loibl S. Expression of Cyclin D1 protein in residual tumor after neoadjuvant chemotherapy for breast cancer. Breast Cancer Res Treat 2017; 168:179-187.
   
type journal paper/review (English)
date of publishing 25-11-2017
journal title Breast Cancer Res Treat (168/1)
ISSN electronic 1573-7217
pages 179-187
PubMed 29177689
DOI 10.1007/s10549-017-4581-1