Expression of cyclin D1a and D1b as predictive factors for treatment response in colorectal cancer

M. P. Myklebust, Z. Li, T. H. Tran, H. Rui, E. S. Knudsen, H. Elsaleh, [No Value] Fluge, B. Vonen, H. E. Myrvold, S. Leh, K. M. Tveit, R. G. Pestell, O. Dahl

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Background:The aim of this study was to investigate the value of the cyclin D1 isoforms D1a and D1b as prognostic factors and their relevance as predictors of response to adjuvant chemotherapy with 5-fluorouracil and levamisole (5-FU/LEV) in colorectal cancer (CRC).Methods:Protein expression of nuclear cyclin D1a and D1b was assessed by immunohistochemistry in 335 CRC patients treated with surgery alone or with adjuvant therapy using 5-FU/LEV. The prognostic and predictive value of these two molecular markers and clinicopathological factors were evaluated statistically in univariate and multivariate survival analyses.Results:Neither cyclin D1a nor D1b showed any prognostic value in CRC or colon cancer patients. However, high cyclin D1a predicted benefit from adjuvant therapy measured in 5-year relapse-free survival (RFS) and CRC-specific survival (CSS) compared to surgery alone in colon cancer (P0.012 and P0.038, respectively) and especially in colon cancer stage III patients (P0.005 and P0.019, respectively) in univariate analyses. An interaction between treatment group and cyclin D1a could be shown for RFS (P0.004) and CSS (P0.025) in multivariate analysis.Conclusion:Our study identifies high cyclin D1a protein expression as a positive predictive factor for the benefit of adjuvant 5-FU/LEV treatment in colon cancer, particularly in stage III colon cancer.

Original languageEnglish (US)
Pages (from-to)1684-1691
Number of pages8
JournalBritish journal of cancer
Issue number10
StatePublished - Nov 6 2012


  • Colorectal cancer
  • Cyclin D1a
  • Cyclin D1b
  • IHC
  • Treatment response

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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