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Clin Cancer Res. 2005 Jan 1;11(1):193-8.

ATBF1-a messenger RNA expression is correlated with better prognosis in breast cancer.

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  • 1Department of Breast and Endocrine Surgery, Nagoya City University Medical School, Nagoya, Japan.

Abstract

PURPOSE:

The AT motif-binding factor 1 (ATBF1) gene was first identified as a suppressor of the alpha-fetoprotein (AFP) gene through its binding to an AT-rich enhancer element of this gene. The gene is located at chromosome 16q22.3-q23.1 where loss of heterozygosity has been observed in various malignant tumors, especially in breast cancer. It was also found that in highly malignant AFP-producing gastric cancer cells the expression of AFP is inhibited by ATBF1-A. This led us to hypothesize that there was a link between levels of ATBF1 expression and the metastatic potential of breast cancer and also, therefore, the prognosis of these patients.

EXPERIMENTAL DESIGN:

In the present study, the level of ATBF1-A mRNA expression was analyzed using quantitative real-time reverse transcriptase-PCR, in 153 female patients with invasive carcinoma of the breast. ATBF1-A protein expression was also determined by immunohistochemistry from available 90 cases of paired tissues. An association was sought between ATBF1-A expression and various clinicopathologic factors.

RESULTS:

ATBF1-A mRNA was expressed at significantly higher levels in breast cancer patients with no axillary lymph node involvement, with small tumors measuring <2 cm and in estrogen receptor-alpha-positive tumors. By contrast, no relationship was found between ATBF1-A mRNA expression and ATBF1-A protein expression, and also no relationship was found between ATBF1-A protein expression and any of the other clinicopathologic factors. Patients expressing high levels of ATBF1-A mRNA tended to have a better prognosis than those expressing low levels. Univariate and multivariate prognostic analyses showed that ATBF1-A mRNA expression is an independent prognostic factor for disease-free survival.

CONCLUSIONS:

In breast cancer, levels of ATBF1-A mRNA may serve as a predictive indicator of lymph node metastasis. The results of this study also imply that ATBF1-A gene expression may have potential both as a marker of endocrine responsiveness and also as a prognostic indicator for breast cancer progression.

PMID:
15671546
[PubMed - indexed for MEDLINE]
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