Abstract

Objective: The main purpose of this retrospective study was to compare cyclin E expression levels in operable breast cancer patients determined using real-time RT–PCR and immunostaining. The prognostic relevance of cyclin E was also investigated.

Methods: Specimens of invasive ductal breast cancer tissues obtained from 124 women during radical mastectomy were analyzed.

Results: Of the tumor samples, 40.3 and 59.7% showed high expression of cyclin E in RT–PCR and immunostaining, respectively. The overall agreement probability was 0.032 according to Scott's π statistic. With a median follow-up of 55.5 months, cyclin E expression assessed using immunostaining was an independent negative prognostic factor in the node positive group (hazard ratio 3.1; 95% CI 1.0–9.2; P = 0.045). Cyclin E expression correlated with absence of steroid receptors and younger age. RT–PCR results did not predict survival in any group of patients.

Conclusions: Disagreement between real-time RT–PCR and immunostaining was demonstrated. Immunostaining seems to be the more reliable method for assessing cyclin E in breast cancer cells.

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